Puzzle 100 - solution

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 The question was

Carla was enjoying her new calculator and discovering all the features and functions. She accidentally multiplied a number by 5 when she should have divided by 5. The incorrect answer displayed was 75. What should have been the correct answer?

Well, the puzzle is obviously ancient as most of us nowadays have forgotten the word calculator. 

Solution:

Let us say the number was x.

x*5 = 75

x = 75/5 = 15

But she should have divided the number by 5.

So the answer is 15/5 = 3


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