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A : B = 100 : 90, A : C = 100 : 70 B/C = (B/A × A/C) B/C = 90/100 × 100/70 B/C = 90/70 = 9:7 In a game if B gets 180 points B/C = 9/7 = (9 × 20) ÷ (7 × 20) = 180/140 C gets 140 points Alternate method: A:B:C = 100 : 90:70 So now B is 180 , hence ratio of B:C = 90: 70 = 180:x So x = 140
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