20 men can finish a work in 30 days. They stared working, but 4 men left the work after 10 days. In how many days would the work be completed?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 35
Let the total work = 600 units
Therefore, 20 men do 20 units in a day i.e. 1 man does 1 unit in a day
20 men work for 10 days, so 200 units will be completed by them.
After 4 men left, 16 men complete 400 units with 16 units each day.
Thus, the number of days taken by them = 400/16 = 25
Total number of days = 10 + 25 = 35