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 do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in :
  1. 4 days
  2. 6 days
  3. 8 days
  4. 12 days
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
  1. 20 days
  2. 22 1 days 2
  3. 25 days
  4. 30 days
A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in:
  1. 15 days
  2. 20 days
  3. 25 days
  4. 30 days
If 6 men and 8 boys can do a piece of work in 10 days while 26 men and 48 boys can do the same in 2 days, the time taken by 15 men and 20 boys in doing the same type of work will be:
  1. 4 days
  2. 5 days
  3. 6 days
  4. 7 days
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