JOHN and Antony can finish the work 36 days if they work together. They worked together for 24 days and then Antony left. JOHN finished the remaining work in another 24 days. In how many days JOHN alone can finish the work?
Choose the correct option.
A) 30 days  B) 72 days  C) 70 days  D) 80 days  E) 90 days
Amount of work done by JOHN and Antony in 1 day = 1/36   Amount of work done by JOHN and Antony in 24 days = 24 Ã— (1/36) = 2/3   Remaining work â€“ 1 â€“ 2/3 = 1/3   JOHN completes 1/3 work in 24 days   Amount of work JOHN can do in 1 day = (1/3)/24 = 1/72   =&gt; JOHN can complete the work in 72 days   Answer : 72 days
<result>B</result>
JOHN and Antony can finish the work 36 days if they work together. They worked together for 24 days and then Antony left. JOHN finished the remaining work in another 24 days. In how many days JOHN alone can finish the work?