Answer:
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
Step-by-step explanation:
I forgot but I used to know this one
Create a ratio and cross multiply
20x - 75 = 14x + 63
6x = 138
x=23
hope this helps :)
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