A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?

Related Mcqs:

1. X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last ?

   A. 6 days
   B. 10 days
   C. 15 days
   D. 20 days

2. A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work?

   A. 70
   B. 50
   C. 40
   D. 60

3. A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it ?

   A. 40 days
   B. 50 days
   C. 60 days
   D. 70 days

4. A alone can finish a work in X days. B alone can finish the same work in X+5 days. Together, they take 6 days to complete the work. Find X

   A. 12
   B. 8
   C. 10
   D. 9

5. P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 50 days to complete the same work. then Q alone can do it in__________?

   A. 30 days
   B. 25 days
   C. 20 days
   D. 15 days

6. P and Q can do a work in 30 days. Q and R can do the same work in 24 days and R and P in 20 days. They started the work together, but Q and R left after 10 days. How many days more will P take to finish the work?

   A. 10
   B. 8
   C. 18
   D. 19

7. A and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days. In how many days will A alone finish the job?

   A. 48
   B. 34(2/7)
   C. 44
   D. 45

8. P can finish a work in 18 days. Q can finish the same work in 15 days. Q worked for 10 days and left the job. how many days does P alone need to finish the remaining work?

   A. 8
   B. 6
   C. 4
   D. 2

9. A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in__________?

   A. 20 days
   B. 30 days
   C. 40 days
   D. none of these

10. P and Q can complete a work in 20 days and 12 days respectively. P alone started the work and Q joined him after 4 days till the completion of the work. How long did the work last?

    A. 5 days
    B. 10 days
    C. 15 days
    D. 12 days