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Races and Games - General Aptitude

Q1:

In a 100 m race, A can give B 10 m and C 28 m. In the same race B can give C:

A 18 m

B 20 m

C 27 m

D 9 m

ANS:B - 20 m

A : B = 100 : 90. A : C = 100 : 72.

B : C = B x A = 90 x 100 = 90 .
A C 100 72 72
When B runs 90 m, C runs 72 m.
When B runs 100 m, C runs 72 x 100 m = 80 m.
90
B can give C 20 m.