Question

Ok math smarties:

Billy has 2 more green marbles than blue marbles. In all, he has 15 marbles. How many blue marbles does he have?

Answer 1

green = blue + 2

blue + green = 15

blue + blue + 2 = 15

2b = 13

You can't have a 1/2 of a marble or can you?

blue = 13/2