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Four boys shared 100 marbles. The second received 20% more than the first, the third received 20 more bullets than the first, and the fourth received 0.8 times more bullets than the first. How many marbles did each boy get?

Correct answer:

a =  20
b =  24
c =  40
d =  16

Step-by-step explanation:

a+b+c+d=100  a+1.2a+(a+20)+0.8 a=100  a+1.2 a+(a+20)+0.8 a=100  4a=80  a=480=20  a=20
b=1.2 a=1.2 20=24
d=0.8 a=0.8 20=16

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