Posted by Samantha on .
John bought some stamps. He used 3/5 of then to mail letters. He had 12 stamps left. How many stamps did he use?

Math 
MathMat,
So 2/5 of the stamps are left with 12 stamps. So there for 1/5 of the stamps is 6 stamps. Now just multiply 6*3 for the amount that he sent.
=18