Races and Games Practice Test 1 with solutions

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Question : 36 of 40

Marks: +1, -0

In a game of billiards, A can give B 12 points in 60 and A can give C 10 in 90. How many points can C give B in a game of 80?

8 points
11 points
10 points
7 points
9 points

Solution:

The required answer =

z({yx_1-xy_1}/{x(y-y_1)})

z = 80, y = 90,

x_1

= 12,

y_1

= 10, x = 60
=

80({90×12-60×10}/{60(90-10)})

=

80({10800-600}/{60×80})

=

80 × {480}/{4800}

= 8 points

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