Antony and Julie can simultaneously complete a work of floor decoration in 15 days and Julie alone in 20 days. In how many days can Antony alone complete the work of floor decoration?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 60.
The time required for Antony and Julie together to complete the work = 15 days
So, they complete 1/15 of the work each day.
The time required for Julie to complete the work = 20 days
So, Julie alone completes 1/20 of the work each day.
Here, (1/15) - (1/20) = 1/60
So, Antony completes 1/60 of the work each day.
Time required for Antony = 1/(1/60) = 60 days
So, Antony alone can complete the work in 60 days.