SOLUTION: The expensive ones cost $7 each, whereas the worthless ones sold for only $2 each. You spent $111 and bought three more expensive ones than worthless ones. How many did you buy.
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Question 669124: The expensive ones cost $7 each, whereas the worthless ones sold for only $2 each. You spent $111 and bought three more expensive ones than worthless ones. How many did you buy.
I know it is a system of equations: 7Ne + 2Nw = 111 is the first equation, don't know what the second equation is? Answer by ReadingBoosters(3246) (Show Source):
You can put this solution on YOUR website! Second equation is
Ne = Nw + 3
...
7(w+3) + 2w = 111
7w + 21 + 2w = 111
9w = 111 - 21
9w = 90
w = 10 worthless
...
e = 10 + 3 = 13 expensive
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