posted by Aly .
Sam had foreign stamps and local stamps. After giving 1/4 of his foreign stamps and 11 local stamps, he had an equal number of foreign and local stamps. How many local stamps did he have in the beginning?
I got 32 for the answer by guessing and checking but what equation would I use to get that answer?
If he started with f foreign and g local stamps, then we have
3f/4 = g-11
3f = 4g-44
4g-3f = 44
so, if g=32, f = 28
But there are lots of other possibilities.