danydandan Posted October 4, 2018 #1 Share Posted October 4, 2018 Replace the dots in the following expression with positive numbers only to get a valid sum: 2.52 +... = 2.51. Good luck. 1 Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #2 Share Posted October 4, 2018 (edited) 7 hours ago, seanjo said: I can only do it using -ve 0.01. Will be interesting to see the solution. I'll leave it unwnswered for a three days. After three days I'll post thr solution. I'll give a hint tomorrow, and the next day. Today's hint is positive numbers! @sci-nerd @Guyver @Harte @RabidMongoose @Timothy @Dejarma I've seen you lot in the scientific section and Guyver is a quant, anyone interested trying to solve it. The solver can then post their own mathematical riddle so we can solve theirs. Edited October 4, 2018 by danydandan Link to comment Share on other sites More sharing options...
Duke Wellington Posted October 4, 2018 #3 Share Posted October 4, 2018 (edited) 10 hours ago, danydandan said: Replace the dots in the following expression with positive numbers only to get a valid sum: 2.52 +... = 2.51. Good luck. 2.52 + (i² / 10) = 2.51 The i is used in its imaginary number context. I haven't counted brackets or the divided and squared symbols as taking up a dot as they arent numbers. Do I get a cookie? Edited October 4, 2018 by RabidMongoose 1 Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #4 Share Posted October 4, 2018 1 minute ago, RabidMongoose said: 2.52 + (i² / 10) = 2.51 The i is used in its imaginary number context. Do I get a cookie? Nope. As I said just positive numbers. Link to comment Share on other sites More sharing options...
Duke Wellington Posted October 4, 2018 #5 Share Posted October 4, 2018 Just now, danydandan said: Nope. As I said just positive numbers. They are lol The squared operation is not a number, it only results in one which is -1 1 Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #6 Share Posted October 4, 2018 1 minute ago, RabidMongoose said: They are lol The squared operation is not a number, it only results in one which is -1 I literally mean only positive numbers, as in no operators or anything. Link to comment Share on other sites More sharing options...
Duke Wellington Posted October 4, 2018 #7 Share Posted October 4, 2018 (edited) 10 hours ago, danydandan said: Replace the dots in the following expression with positive numbers only to get a valid sum: 2.52 +... = 2.51. Good luck. Well I play properly by replacing dots I can get: 2052 + 199 = 2251. But I am left with the end dot. Is it a full stop? Edited October 4, 2018 by RabidMongoose Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #8 Share Posted October 4, 2018 1 minute ago, RabidMongoose said: Well I play properly by replacing dots I can get: 2052 + 199 = 2251. But I am left with the end dot. Positive numbers. Link to comment Share on other sites More sharing options...
Duke Wellington Posted October 4, 2018 #9 Share Posted October 4, 2018 Just now, danydandan said: Positive numbers. What so: 2152 + 299 = 2451 1 1 Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #10 Share Posted October 4, 2018 1 minute ago, RabidMongoose said: What so: 2152 + 299 = 2451 Yeah. Wooohoo. Took a group of PhD students a whole day to figure out. Slippery slope when you only see the three dots after the plus. Link to comment Share on other sites More sharing options...
Duke Wellington Posted October 4, 2018 #11 Share Posted October 4, 2018 (edited) 2 minutes ago, danydandan said: Yeah. Wooohoo. Took a group of PhD students a whole day to figure out. Slippery slope when you only see the three dots after the plus. It took me about 20 minutes. Mind you I have degrees too and a job I do maths and algebra in all day long. Edited October 4, 2018 by RabidMongoose Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #12 Share Posted October 4, 2018 (edited) 4 minutes ago, RabidMongoose said: It took me about 20 minutes. Mind you I have degrees too and a job I do maths and algebra all day long. I was given it by a mathematician while I was a doing my master. I must admit it took awhile as I like others overcomplicated it. Her reason for presenting it was to teach people that more often than not people overcomplicate maths problems. After she said it took my eight year old a few minutes to get. So now it's your turm to present a mathematics riddle. Edited October 4, 2018 by danydandan Link to comment Share on other sites More sharing options...
Duke Wellington Posted October 4, 2018 #13 Share Posted October 4, 2018 (edited) The answer for the sum 2+2 is the same as the answer for 2x2. Find a set of three different whole numbers whose sum is equal to their total when multiplied. So: A + B + C = A x B x C Answers A= B= C= Edited October 4, 2018 by RabidMongoose Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #14 Share Posted October 4, 2018 (edited) 1 hour ago, RabidMongoose said: The answer for the sum 2+2 is the same as the answer for 2x2. Find a set of three different whole numbers whose sum is equal to their total when multiplied. So: A + B + C = A x B x C Answers A= B= C= 123. 1+2+3 is 6. 1.2.3 is 6. Thus 1+2+3=1.2.3 Edited October 4, 2018 by danydandan 1 Link to comment Share on other sites More sharing options...
Timothy Posted October 4, 2018 #15 Share Posted October 4, 2018 (edited) 14 hours ago, danydandan said: Replace the dots in the following expression with positive numbers only to get a valid sum: 2.52 +... = 2.51. Good luck. Don’t want to read any responses. Just want to clarify the sum first please sir: Does the . After the 2.51 count too? Or no? I see it’s separated by a space, but just checking before I confuse myself more. Edit: Possible solution, unless I don’t understand the riddle... Spoiler 2152 + 199 = 2351 ? If that’s right, then there should be multiple solutions Edited October 4, 2018 by Timothy Edit. Link to comment Share on other sites More sharing options...
danydandan Posted October 4, 2018 Author #16 Share Posted October 4, 2018 2 minutes ago, Timothy said: Don’t want to read any responses. Just want to clarify the sum first please sir: Does the . After the 2.51 count too? Or no? I see it’s separated by a space, but just checking before I confuse myself more. No that dot doesn't count. My phone automatically puts a full stop when I press enter. But you don't have to use all the dots. Link to comment Share on other sites More sharing options...
Timothy Posted October 4, 2018 #17 Share Posted October 4, 2018 4 minutes ago, danydandan said: No that dot doesn't count. My phone automatically puts a full stop when I press enter. But you don't have to use all the dots. Cool beans. Did I get it correct? Link to comment Share on other sites More sharing options...
danydandan Posted October 5, 2018 Author #18 Share Posted October 5, 2018 9 hours ago, Timothy said: Cool beans. Did I get it correct? Yeap. 1 Link to comment Share on other sites More sharing options...
Habitat Posted October 5, 2018 #19 Share Posted October 5, 2018 Turn it up, they are decimal points inside those numbers, not "dots" ! You have gone dotty ! Link to comment Share on other sites More sharing options...
danydandan Posted October 5, 2018 Author #20 Share Posted October 5, 2018 (edited) 4 minutes ago, Habitat said: Turn it up, they are decimal points inside those numbers, not "dots" ! You have gone dotty ! Nope they are dots. How you choose to see them is entirely up to you. But they are ...........s. Some of them are decimal points some are operators and some are just dots. Can you please tell me which ones are just dots, just decimal points and just operators. Lol. Edited October 5, 2018 by danydandan Link to comment Share on other sites More sharing options...
danydandan Posted October 5, 2018 Author #21 Share Posted October 5, 2018 12 hours ago, danydandan said: 123. 1+2+3 is 6. 1.2.3 is 6. Thus 1+2+3=1.2.3 If my response is correct, I know it is, can you confirm please. I'll post a new teaser when you can confirm. Link to comment Share on other sites More sharing options...
Habitat Posted October 5, 2018 #22 Share Posted October 5, 2018 11 minutes ago, danydandan said: Nope they are dots. How you choose to see them is entirely up to you. But they are ...........s. Some of them are decimal points some are operators and some are just dots. Can you please tell me which ones are just dots, just decimal points and just operators. Lol. Even the dodgy question presupposes that people will assume the "dots" internal to those numbers are decimal points. Case dismissed ! 1 Link to comment Share on other sites More sharing options...
danydandan Posted October 5, 2018 Author #23 Share Posted October 5, 2018 (edited) 19 minutes ago, Habitat said: Even the dodgy question presupposes that people will assume the "dots" internal to those numbers are decimal points. Case dismissed ! I know that's the point. But my question my rules and people have already gotten it. So I don't see the issue. Also the question was designed to show that people with too much knowledge usually over think things, I know I certainly do. Did you see the new Coca-Cola ads for Australia? They are very upside down. Edited October 5, 2018 by danydandan Link to comment Share on other sites More sharing options...
danydandan Posted October 5, 2018 Author #24 Share Posted October 5, 2018 5 minutes ago, seanjo said: Yeah I overthought it, I'm not exactly knowledgeable, but I thought there must be some mathematical expression that would allow a positive to become a negative...dull ****er I am! The funny thing about it is, ask a bunch of 8-12 year olds and they'll answer it correctly, because they haven't advanced knowledge of mathematics. Link to comment Share on other sites More sharing options...
Guyver Posted October 5, 2018 #25 Share Posted October 5, 2018 On 10/4/2018 at 12:30 AM, danydandan said: Replace the dots in the following expression with positive numbers only to get a valid sum: 2.52 +... = 2.51. Good luck. The opposite of .01. So, 2.52 + -(.01) = 2.51 Link to comment Share on other sites More sharing options...
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