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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 - 6 years agoHelpfull: Yes(3) No(2)
- ans:d
4(5M+12B)=5(7M+6B)
18B=15M
M:B=6:5 - 5 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 - 5 years agoHelpfull: Yes(0) No(0)
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