Two fathers and two sons go into a candy shop. They each spend $0.50. Yet they only spend $1.50.
How is this possible?
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Only 3 people came in. So how could it have been 2 fathers and 2 sons? Wouldn't it be 4 people, meaning they had to spend $2.00?
Well here it is.
There was a grandfather, a father, and a son. 2 fathers, 2 sons. How? The grandfather and father are both fathers, and the father and the son are both sons. 2 fathers and 2 sons.