In a game of 90 points, A can give B 15 points and C 30

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In a game of 90 points, A can give B 15 points and C 30 points. How many points can B give C in a game of 100 points?

1. 140
2. 20
3. 50
4. 30

Correct Option: B

A : B : C = 90 : 75 : 60
B:C = 75 / 60 = ( 75 x ¹⁰⁰⁄₇₅ ) / ( 60 x ¹⁰⁰⁄₇₅) = 100 / 80
Hence, in a game of 100 points, B can give C(100 - 80)
= 20 points.