10 persons can cut 7 trees in 14 days. In how many days can 16 persons cut 12 trees?
A16 days
B13 days
C15 days ✓ Correct
D12 days
Correct answer: (C) 15 days
Explanation
16 persons take 15 days.
One tree needs 10 x 14 / 7 = 20 person-days.
12 trees need 12 x 20 = 240 person-days.
With 16 persons, days = 240 / 16.
= 15 days.
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