SSC CGL Tier II 21 Sep 2014 Paper

Question : 58 of 100

Marks: +1, -0

A man is twice as fast as a woman and a woman is twice as fast as a boy in doing a work. If all of them, a man, a woman and a boy can finish the work in 7 days, in how many days a boy will do it alone ?

Validate

Solution:

(1) According to the question,
1 man ≡ 2 women ≡ 4 boys
∴ 1 man + 1 woman + 1 boy = (4 + 2 +1) boys = 7 boys

∴{M}_{1} \ {D}_{1}= {M}_{2} {D}_{2}

⇒ 7× 7=1 ×{D}_{2}

⇒{D}_{2}=

days

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