31.
39 persons can repair a road in 12 days, working 5 hours a day. In how many
days will 30 persons, working 6 hours a day, complete the work?
[A]10
[C]
14
[B]13
[D]
15
Answer : B
Explanation :
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Let
the required number of days be x.
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Less
persons,More days (Indirect Proportion)
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More
working hrs per day, Less days (Indirect Proportion)
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Persons
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30
: 39
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Working
hrs / day
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6
: 5
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::
12 : x
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