At a game of billiards,A can give B 15 points in 60 and A can give C 20 points in 60.How many points can B give C in a game of 90 ?	Select.
A) 30 points B) 20 points C) 10 points D) 12 points E) None of these
Solution   A : B = 60 : 45 and A : C = 60 : 40.   ∴ B/C =( B/A x A/C) = (45/60 x 60/40) = 45/40 =90/80= 90 : 80   ∴ B can give C 10 points in a game of 90.   Answer 10 points
<result>C</result>
At a game of billiards,A can give B 15 points in 60 and A can give C 20 points in 60.How many points can B give C in a game of 90 ?