there are total 100 balls, person A has 2 times more than person B and 20 more than person C. Number of balles does A has?
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If A has A balls then B=½A and C=A-20, and A+½A+A-20=100. So 2½A=120, that is, 5A=240, A=240/5=48 balls.

CHECK: A has 48 balls, B has 24 balls and C has 28 balls so there are 48+24+28=100 balls altogether. OK!

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