SOLUTION: David offers rides on his space adventure machine at 5 dollars per person. The ride includes souvenir 3-D glasses for each rider that cost David $2.00 per pair. Each ride can only

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Question 1083452: David offers rides on his space adventure machine at 5 dollars per person. The ride includes souvenir 3-D glasses for each rider that cost David $2.00 per pair. Each ride can only hold 3 people. If the electricity to run the ride once costs David $2.00, how many rides must he give to make $70 after all his expenses?
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
x[3(5)-(3(2)+2)] = 70
x7 = 70
x = 10
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Check:
3 pairs of glasses . . . . . 3*2 = 6
electricity to run the ride: . . .= 2
. . . . . . . . . . . . . . . . -----------
Total expense per ride . . . . . . 8
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Receipts:
3 individuals at $5 each = 15
Less expenses . . . . . .= 8
. . . . . . . . . . . .--------
Net profit per ride . . . 7
To make $70: 70/7 = 10