Question

bill has two dollars in quarters and dimes. the number of quarters is four less than twice the number of dimes find the number of coins each type

Answer 1

Okay, let's make x the number of dimes. The equation should look like this:
10x + 25(2x-4) = 200
10x + 50x -100 = 200
60x = 300
x = 5
so, 5 dimes and 6 quarters