# A contractor undertakes to dig a canal.6 km long,in 35 days and employed 90 men.He finds that after 20 days only 2km of canal have been completed.How many more men must be employed to finish the work in time?

2
by asdfghjk

2014-07-25T13:31:19+05:30
90 MeN ------------20 days -----------2KM
1    MeN -------------20 days ----------2/90 KM

20 days -----------1 MAN --------------2/90 km
1 day ----------------1MAN --------------2/90*20=1/900 km
remains days = 15,  remains work=6-2=4 km
15 days -------------1 MAN ---------------1*15/900 km
let x MAN do 4km in 15 days
x*15/900=4
x=240 MeN
yea! right 240-90=150
tell the ans
2014-07-25T13:43:13+05:30

we can solve it by simple Equality here

no of days remaining=35-20=15

no of km remaining 6-2=4km

so by equation

6*35*90=x*15*4

so x=35*9=315

so no of more men required is 315-90=225

hence 225 more men required

by which eqn
hey Dude ..here I have used simply the rule of equality ...u know that F=MA then units on the both side of equation is same i.e Newton...similarly I hv equated the two side considering the units...it saves time a lot ...thank you