The dealer

The dealer planned to sell 40% of the cars he had in stock in May. However, he sold 20 less cars, ie only 15% of cars.
a) How many cars did he have in stock?
b) How many cars did he sell in May?

Correct result:

a =  80
c =  12


 b=0.40 a b20=c c=0.15 a  0.4ab=0 bc=20 0.15ac=0  a=80 b=32 c=12

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