L&T Company Numerical Ability Time and Work

6 men and 10 boys finish a piece of work in 4 days, 5 men and 6 boys do it in 6
days. The ratio between the efficiencies of a man and boy is?

Read Solution (Total 2)

6m+10m=1/4 ......(1)
5m+6b=1/6 ......(2)
solve 1 & 2,
m:b=3:2
6 years agoHelpfull: Yes(0) No(1)

6m+10b=1/4=>24m+40b=1
5m+6b=1/6=>30m+36b=1
Now Two Equations are Equal equate them:
24m+40b=30m+36b
6m=4b
m:b=2:3
5 years agoHelpfull: Yes(0) No(0)

L&T Other Question

A, B and C can do a piece of work in 24, 30 and 40 days respectively. They start
the work together but C leaves 4 days before the completion of the work. In how
many days is the work done? A student is to answer 9 out of 12 questions in an examination such that he must choose at least 5 from the first six questions. The number of choices available to him is