Question

If 20 men can build a wall 56 meters long in 6 days, what length of a similar wall can be built by 35 men in 3 day?

Answer 1

Let the required length be x meters

More men, More length built     (Direct proportion)  

Less days, Less length built      (Direct Proportion)

=> (20 x 6 x X)=(35 x 3 x 56)  

=> x = 49  

Hence, the required length is 49 m.