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from 1: 2d = 3c-.10
from 2: (d+c)/2 = .35 = d+c = .7

two variables and 2 equations.

d = 3/2c - .05

3/2c - .05 + c = .7
3c - .1 + 2c = 1.4
5c = 1.5
c = .3 which means d must be .4
d = .4

so now we have the prices for each doughnut and each cupcake, but that doesn't help us solve the problem.

.3c + .4d = 6
3c + 4d = 60

he could buy 5 cupcakes and 15 doughnuts or 8 cupcakes and 9 doughnuts. It's impossible to nail down exactly how many of each he bought.

Answer E

EDIT: the only trick here is remembering what the question is asking for. It would be easy to look at the information and say "yeah, you can find the price of a doughnut from this. It must be C"

yeah, even with the two statements, you cant find out how many cupcakes or doughnuts were purchased .... you can find the price per, but not the actual amount of the items that was purchased.