Question : 60 men can complete a work in 40 days. They start to work together but after every 10 days, 5 men leave work. In how many days will the work be completed?
Option 1: 47.5
Option 2: 49.5
Option 3: 42.5
Option 4: 45.5
Correct Answer: 47.5
Solution : Given: 60 men can complete a work in 40 days. Total work = 60 × 40 = 2400 units 60 men worked in 10 days = 600 units 55 men worked in 10 days = 550 units 50 men worked in 10 days = 500 units 45 men worked in 10 days = 450 units Total work left = 2400 – (600 + 550 + 500 + 450) = 2400– 2100 = 300 units Now, 40 men will do 300 units in = $\frac{300}{40}$ = 7.5 Total number of days to finish the work = 40 + 7.5 = 47.5 days Hence, the correct answer is 47.5.
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