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posted by sal on Tuesday, November 11, 2008 at 7:05pm.

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:________________

If dimes = D and nickels equals N, and we let D = 2N, Then 5 N + 10 D = 25 N = 250

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.

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