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Sergio made a whole pan of lasagna. His friends ate some of the lasagna. There was 1/3 of the pan of lasagna left. Sergio said his friends ate 5/6 of the lasagna.

Is Sergio's answer reasonable?
A. No, it is not reasonable because 1/3 x 5/6 = 5/18
B. No, it is not reasonable because 1 - 1/3 = 2/3
C. Yes, it is reasonable because 1/3 + 1/2 = 5/6



Answer :

The answer is B. 1/3 is equal to 2/6. If 2/6 of the pan of lasagna was left, his friends could not have eaten 5/6. They would have had to have eaten 4/6, which is the same as 2/3. 

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