Question

6 carpenter working 7 hour a day can complete 20 table in 20 days how many days will 12 carpenter work 6 hours a day take to complete 36 tables

Answer 1

6 carpenter working 7 hour a day can complete 20 table in 20 days

Total man-hour needed for 20 table = 6 × 7 × 20
(1 man-hour = 1 man working 1 hour)

Total man-hour needed for 1 table = 6×7×20 / 20 = 6×7 = 42 hours

man-hour needed for 36 tables = (36×42) hours

we have 12 carpenter who work 6hrs a day

number of days = (36×42) / (12×6) = 21 days

Answer: They need 21 days

Answer 2

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6 carpenter working 7 hour a day can complete 20 table in 20 days

Total man-hour needed for 20 table = 6 × 7 × 20

(1 man-hour = 1 man working 1 hour)

Total man-hour needed for 1 table = 6×7×20 / 20 = 6×7 = 42 hours

man-hour needed for 36 tables = (36×42) hours

we have 12 carpenter who work 6hrs a day

number of days = (36×42) / (12×6) = 21 days

Answer: They need 21 days.

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