Class VIII

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
  1. 1 4
  2. 1 10
  3. 7 15
  4. 8 15
A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in :
  1. 8 days
  2. 10 days
  3. 12 days
  4. 15 days
Sakshi can do a piece of work in 20 days. Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work is:
  1. 15
  2. 16
  3. 18
  4. 25
2. A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:
  1. 9 1 days 5
  2. 9 2 days 5
  3. 9 3 days 5
  4. 10
A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work?
  1. 18 days
  2. 24 days
  3. 30 days
  4. 36 days
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