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Three boys and five girls together can finish a job in 3 days. Working on the same job 3 girls take 5 days more than the time required by 2 men. What is the ratio of efficiency of a boy to a girl?


Options:
A .   2: 1
B .   5: 2
C .   3: 2
D .   4: 1
Answer: Option B
:
B

3B+5G=33.33%..............(i)
Time taken by 3 women =1003G        ;      Time taken by 2 men =1002B
1003G1002B=5  33.33G50B=5.................(ii)
Option (a): B=2G  11G = 33.33%  G = 3.03 , B = 6.06. Substitute in (ii),  11 - (approx 8) = approx 3.
Option (b): B=2.5G  12.5G = 33.33%  G = 83 , B=203, Substitute in (ii), 12.5 - 7.5 = 5  which is the difference given in the question.Hence option (b).



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