math
posted by Anonymous .
Sal keeps quarters, nicles, and dimes in his change jar. He has a total pf 52 coins. He has three more quarters than dimes and five fewer nicles than dimes. How many dimes does Sal have?
a 13
b 18
c 20
d 21

You can try trial and error.
a. 16 quarters, 13 dimes, 8 nickles = 37 coins Nope. That isn't the answer.
Keep going til you find the right answer. 
Let x = number of dimes. Since the value of the coins does not matter, the quarters = x + 3, dimes = x and nickels = x5.
(x + 3) + x + (x  5) = 52
Solve for x.
I hope this helps. Thanks for asking.