A builder decided to build a house in 50 days. He employed
150 men at the beginning and another 80 men after 20 days and completed the
work in the stipulated time. If he had not employed the additional men, how
many days behind schedule would it have been finished?
(1) 10 days
(2) 12 days
(3) 15 days
(4) 16 days
(2) 12 days
(3) 15 days
(4) 16 days
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