Three numbers

Find three numbers so that the second number is 4 times greater than the first and the third is lower by 5 than the second number. Their sum is 67.


a =  8
b =  32
c =  27


b = 4a
c = b - 5

4a-b = 0
b-c = 5
a+b+c = 67

a = 8
b = 32
c = 27

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