Ozymandias Posted October 9, 2018 #51 Share Posted October 9, 2018 On 10/8/2018 at 8:54 AM, danydandan said: In a petri dish, there is a fungus. Every hour the fungus doubles in size. If it takes 48 hours for the fungus to cover the entire petri dish, how long would it take for the fungus to cover half of the petri dish? The answer is: 47 hours. If it doubles in size every hour and fills the dish after 48 hours then one hour beforehand it was half the size and filled half the dish. Link to comment Share on other sites More sharing options...
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