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If in a race of 120m X can beat Y by 20m and Z by 35m, then Y can beat Z by:

A.	12m	B.	10m
C.	15m	D.	18m

Answer and Explanation

Answer:18m

Explanation:
In a race of 120m, as X beats Y by 20m, when X runs 120m, Y runs 100m.
Similarly, as X beats Z by 35m, when X covers 120m, Z covers 85m.
Hence, when Y runs 100m, Z runs 85m.
When Y runs 120m, Z runs (120 * 85) / 100 = 102m
Hence, Y beats Z by 18m.

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