Ritu and Mona can finish painting a house together in 18 days. Ritu alone would take 27 days to finish the painting. How long will it take Mona to finish the painting on her own?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 54 days.
Ritu’s 1 day work = 1/27
Together 1 day work = 1/18
Mona’s 1 day work = (1/18) - (1/27)
= (3 - 2) / 54 = 1/54
So, Mona will take 54 days to finish painting alone.