**Q1**. A do any work in 20 days and B do any work in 30 days, then how long will they do the work together?

**Q2**. A do any work in 12 days and B do any work in 24 days, then how long will they do the work together?

**Q3**. A,B and C can do a work alone in 20,12 and 15 days respectively.In how many days they complete the work together?

**Q4**. A man can complete a task in 5 days. But with the help of his son, he can complete it in 3 days. How long will his son take to complete the task alone?

**Q5**. A and B can complete a work in 4 days. If alone, one can complete a work in 6 days, how many days alone will this work be completed?

**Q6**. A and B can complete one task within 12 days, B and C, in 4 days and C and A in 6 days. B. How much time wil it take to complete this work alone?

**Q7**. A and B can complete one task within 20 days, B and C, in 12 days and C and A in 15 days. (i)How much time wilL A+B+C take to complete this work together? (ii)Then how much time will they take separately to do that work?

**Q8**. A and B can complete 8 days and work C in 12 days Together all three can complete it in 6 days. How long will A and C take to accomplish that task?

**Q9**. A man has three sons, first and second can complete a work in 24 and 36 days respectively. In how many days the 3rd son will complete the work, if the man could alone complete the whole work in 3 3/11 days. The man can do double the work in same time. In which time all his sons together can complete the work.

**Q10**. 2 men can build a wall in 15 and 20 hours respectively but if they work together they use 280 less bricks per hour and build a wall in 12 hours. Find the number of bricks in the wall.

**Q11**. Two candles of same height can burn completely in 4 hrs and 6 hrs respectively. If both start burning at same time at their respective constant speed, then find after how much time ratio of their height become 2:3.

**Q12**. A+B, B+C can complete a work in 12 and 16 days respectively. A work for 5 days and B work for 7 days and C complete the remaining work in 13 days. Then find C would complete the work in how many days?

**Q13**. A+B, B+C can complete a work in 12 and 6 2/3 days respectively. A work for 3 days and B work for 4 days and C complete the remaining work in 7 days. Then find A would complete the work in how many days?

**Q14**. A and B can do a job in 15 and 10 days respectively. They began the work together but b leaves after 2 days. Then the total number of days needed for the completion of the work is :

**Q15**. A and B started working together but after some day A left the work and the whole work will complete in 9 days. Find after how many days A left, if A & B complete the work in 10 and 15 days respectively.

(1) 4 days

(2) 6 days

(3)10days

(4) 10 1/2 days

**Q16** Three men A, B and C complete the work in 10, 15 and 12 days. If A, B and C starts work together. After 2 days A left the work and next after 2 days C also left. Then find in how many days the whole work will complete.

**Q17**. Three men A, B and C complete the work in 10, 12 and 15 days. A, B and C starts work together, A and B left the work 3days before the completion of the work, then the whole work will finish in how many days.

(1)6

(2)7

(3)8

(4)9

**Q18**. A can do a piece of work in 18 days and B in 12 days. They began the work together, but B left the work 3 days before its completion. In how many days, in all, was the work completed?

1)12 days

2)10 days

3)9.6 days

4)9 day

**Q19**. Three men A, B and C complete the work in 10, 12 and 15 days. If A left the work 2 days before the completion of the work and B left the work 3 days before the completion. Work will finish in how many days?

**Q20**. Three men A, B and C complete the work in 15, 12 and 10 days. A, B and C starts work together but C left the work after two days and B left the work 3 day before the completion of the work. In how much time the whole work will be completed?

**Q21**. Three men A, B and C complete the work in 10, 12 and 15 days. A, B and C starts work together but after 3 days A left thw work and C left thw work 4 days before the completion of work. In how much time the whole work be completed?

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