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Lew spent $6.00 on one kind of cupcake and one kind of [#permalink] ### Show Tags 11 Sep 2006, 16:27 This topic is locked. If you want to discuss this question please re-post it in the respective forum. Lew spent$6.00 on one kind of cupcake and one kind of donut. How many donuts did he buy?

1) The price of 2 donuts is $0.10 less then price of 3 cupcakes 2) The arithmetic mean of 1 donut and 1 cupcake is$0.35

Can't I use equations:

d+c=600

1) 2d=3c-10 -> d=3/2c-5 and substitute to get the price of d or c?