A man can do a job in 15 days. His father takes 20 days and his son finishes it in
they take to complete the jon if they all work together?
a) Less than 6 days
b) Approximately 6.4 days
c) Exactly 6 days
d) Exactly 7 days
Answers
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Answer:
Work done by man in 15 days= 1
Work done by man in 1 day= 1/15
Work done by father in 20 days=1
Work done by father in 1 day= 1/20
Work done by son in 25 days=1
Work done by son in 1 day=1/25
Work done by altogether= Work of man+Work of father+Work of son
= (1/15+1/20+1/25)days
=(20+15+12/300)days
=47/300 days = 6 whole 18/47 days.
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