1.

If 20 men can build a wall 66 metres long in 6 days, what length of a similar can be built by 86 men in 8 days?

Answer»

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 6: 3 : : 56 : x 

Therefore (20 x 6 x x)=(35 x 3 x 56)

x=(35 x 3 x 56)/120=49 

Hence, the required length is 49 m.



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