John has $2.50 in nickels and dimes in his wallet. He has twice as many dimes as nickels. How many of each coin does he have? Let dimes = _____. Let nickels = _______. Equation:________________

Answer 1

If dimes = D and nickels equals N, and we let D = 2N,

Then 5 N + 10 D = 25 N = 250

Answer 2

Dimes=d Nickels=n

.05n + 0.1d = 2.50
d = 2n
0.05n + 0.1(2n) = 2.50
0.05n + 0.2n = 2.50
0.25n = 2.50
n = 2.50/0.25
n=10
d=20
There are 10 nickels and 20 dimes.