A number theory problem by Esmin Kattan-Howard
Larry typed 9/20 of his book report on his computer. Then he printed out 5/12 of his book report on his computer printer. Suddely, there was a power outage, and he discovered that he hadn't saved his book report before the power went off. What fractional part of the book report was lost when the power failed?
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1 solution
11/ 20 h as not been typed, and so saved. 5/12 is. Typed. So 11/20 + 5/12 = 29/30 is saved. 1/30 Lost.