You and your friend each start a car-washing service. You spend $25 $ 25 on supplies and charge $10 $ 10 per car. Your friend spends $55 $ 55 on supplies and charges $13 $ 13 per car. How many cars do you have to wash to earn the same amount of money as your friend?

Question

Mathematics

Cowan

21 February, 12:23

You and your friend each start a car-washing service. You spend $25 $ 25 on supplies and charge $10 $ 10 per car. Your friend spends $55 $ 55 on supplies and charges $13 $ 13 per car. How many cars do you have to wash to earn the same amount of money as your friend?

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Answers (2)

Know the Answer?

Giada Acevedo · Answer 1

If this is from TTM the answer is 10 cars.

Skylar Miller · Answer 2

if you wash 13 cars, you will earn 13*10 = 130 $

your friend will also learn 130 $ but he only need to wash 130/13 = 10 cars

SO the number of the car you have to wash is 13 cars