Question : A can complete a certain work in 35 days and B can complete the same work in 15 days. They worked together for 7 days, and then B left the work. In how many days will A alone complete 60% of the remaining work?
Option 1: 10
Option 2: 15
Option 3: 8
Option 4: 7
Correct Answer: 7
Solution :
Given,
A completes the work in 35 days.
B completes the work in 15 days.
A's 1 day's work
B's 1 day's work
So, (A + B)'s 1 day's work =
⇒ Work completed by A + B in 7 days
So, Remaining work =
⇒ 60% of the remaining work =
So, time taken by A to finish this work =
Hence, the correct answer is 7.