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 days?  Choose the correct choice from the following:
A) 44
B) 48
C) 45
D) 47
E) 49
Let the required length be x meters   More men, More length built (Direct proportion)   Less days, Less length built (Direct Proportion)   Men 20:35 and Days 6:3::56:x   Therefore (20 x 6 x (X))=(35 x 3 x 56)   x=(35x3x56)/120=49   Hence, the required length is 49 m.   Answer is 49.
<result>E</result>
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 days?