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

Step-by-step explanation:

Alright, lets get started.

Suppose number of cars to be washed is x

You are charging $10 per car, so profit of yours after subtracting the supplies =

Your friend is charging $ 13 per car, so his profit after subtracting the supplies =

Both the amount earned are same, so

hence, you are washing 10 cars.   :    Answer

Hope it will help :)