The dealer

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

Correct answer:

a =  80
c =  12

Step-by-step explanation:

b=0.40 a b20=c c=0.15 a  0.4ab=0 bc=20 0.15ac=0  Row30.40.15 Row1Row3 0.4ab=0 bc=20 0.375bc=0  Row30.375 Row2Row3 0.4ab=0 bc=20 0.625c=7.5  c=0.6257.5=12 b=20+c=20+12=32 a=0.40+b=0.40+32=80  a=80 b=32 c=12

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