If 20 men can build a water fountain 56 metres long in 14 days, what length of a similar water fountain can be built by 35 men in 3 days?  Choices:	A) 21 m	B) 24 m	C) 27 m	D) 29 m	E) 30 m
Explanation :   Let the required length be x metres   More men, More length built (Direct Proportion)   Less days, Less length built (Direct Proportion)   Men 20: 35   Days 14: 3 : : 56 : x   Therefore (20 x 14 x x)=(35 x 3 x 56)   x=(35 x 3 x 56)/280=49   Hence, the required length is 21 m.   21 mnswer : 21 m
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If 20 men can build a water fountain 56 metres long in 14 days, what length of a similar water fountain can be built by 35 men in 3 days?