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?	Choose the correct choice from the following answers:
A) 53 m	B) 46 m	C) 94 m	D) 49 m	E) 64 m
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.   Answer is 49 m
<result>D</result>
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?