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

18 m
20 m
27 m
9 m

Correct Answer: 20 m

Explanation:

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.

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