60 men can complete a work in 40 days. They start work together but after every 10 day, 5 men leave the work. In how many days will the work be completed?
A47.5
B49.5
C42.5
D45.5
Answer:
A. 47.5
Read Explanation:
Total workload = 60 × 40 = 2400
60 men did the work in 10 days = 600
55 men did the work in 10 days = 550
50 men did the work in 10 days = 500
45 men did the work in 10 days = 450
Total work units left = 2400 – (600 + 550 + 500 + 450) = 2400 – 2100 = 300
40 men will do 300 units in = 300/40 = 7.5
Total number of days to finish the work = 40 + 7.5 = 47.5 days