L&T Company Numerical Ability Time and Work

5 men and 12 boys finish a piece of work in 4 days, 7 men and 6 boys do it in 5
days. The ratio between the efficiencies of a man and boy is?
A. 1:2 B. 2:1 C. 2:3 D. 6:5

Read Solution (Total 3)

5m + 12b=1/4 ....(1)
7m+ 6b=1/5 .....(2)
solve 1 &2,
m:b=6:5
5 years agoHelpfull: Yes(3) No(2)

ans:d
4(5M+12B)=5(7M+6B)
18B=15M
M:B=6:5
4 years agoHelpfull: Yes(1) No(1)
(5m - 12b)*4 = (7m - 6b)*5

20m - 48b = 35m - 30b(Solve First man side Then solve boys Side. )
20m-35m = 48b - 30b
15m = 18b
M : B = 6 : 5
4 years agoHelpfull: Yes(0) No(0)

L&T Other Question

From its total income, A sales company spent Rs. 25,000 for advertising, one-third of the remainder on commissions and had Rs. 12000 left. What was its total income? Two same glasses are respectively 1/4th 1/5th full of milk. They are then filled
with water and the contents mixed in a tumbler. The ratio of milk and water in
the tumbler is?
A. 3:8 B. 9:31 C. 8:21 D. 10:27