A man is twice as fast as a woman and a woman is twice as fast as a boy. If all of them i. e. a man, a woman and boy can finish together in 4 days, in how many days a boy shall do it alone?
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Answer:
7 days
Step-by-step explanation:
Let the days in which. the boy can do the work be x.
Work done by boy in 1 day= 1/x
Work done by woman in 1 day= 1/2x
Work done by man in 1 day= 1/4x
Work done by all of them in one day= 1/4
Therefore, 1/x+1/2x+1/4x= 1/4
7/4x= 1/4
7= 1/4*4x
4x= 7*4
x= 7
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