general math MCQ #378

A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it?

general math MCQ #378

Question 1
Q1. A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it?
- A) 40 days
- B) 50 days
- C) 60 days
- D) 70 days
Answer: 60 days
Explanation: 1/A = 1/15−1/20 = (4−3)/60 = 1/60; A alone takes 60 days.