SOLUTION: Some students held a car wash. They charged $3 to wash each car. The students made a profit of $330 after they spent $15 on supplies for the cash wash. How many cars did they wash?

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Question 818945: Some students held a car wash. They charged $3 to wash each car. The students made a profit of $330 after they spent $15 on supplies for the cash wash. How many cars did they wash?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
profit equation:
p = r - c
---
r = 3n
c = 15
p = 3n - 15
---
330 = 3n - 15
3n = 345
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n = 115 cars
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