25 persons can complete a work in 60 days. They started the work. 10 persons left the work after x days. If the whole work is completed in 80 days, then what is the value of x?
Show answer & explanation
Correct answer: A
Explanation
The question has been modified since it was incorrect according to the answer key released by the SSC.
The correct answer is option 1 i.e. 30.
25 x 60 = 1500
25 x 60 = (25x) + 15(80 - x)
1500 = 25x +1200-15x
300 = 10x
x = 30