Type A
1) A and B can complete a work in 30 days and 20 days respectively. In how many days they together complete the work.
2) A,B and C can complete a work in 12 days, 15 days and 20 days respectively. In how much time they together complete the whole work.
3) A can do a work in 2 hrs. B do the three times of this work in 8 hrs. and C in 8 hrs. if they work together then how many days the work will be completed?
(a)1 hrs. (b)2 hrs.
(c) 3 hrs. (d) 4 hrs.
4) A can do any work in 20 days and B in 5 days. If efficiency of C is equal to the efficiency of A + B . Then in how many days they can complete the whole work?
(a) 2 days (b) 4 days
(c) 3 days (d) 6 days
5) A & B can complete a piece of work in 10 and 12 days respectively. A and B start work together and after 3 days A left the work then calculate in how may days work will completed?
6) A & b can complete a piece of work in 10 and 15 days respectively. A and B start work together and after 2 days A left the work then calculate in how many days work will be completed?
7) A and B can complete a work in 10 and 15 days respectively. A ad B started working together but after some time A left the work and the whole work will be completed in 9 days. Then calculate after how much time A left the work.
8) A and B can complete a work in 20 and 30 days respectively. A ad B started working together but after some time B left the work and the whole work will be completed in 16 days. Then calculate after how much time A left the work.
9) A and B can complete a work in 20 and 30 days respectively. A ad B started working together but after some time B left the work and the rest work will be completed by A in next 10 days. Then calculate after how much time A left the work.
10) Three men A,B and C can complete a work in 10,12 and 15 days respectively, then give the answer of the following questions.
(i) If A,B and C starts work together but after 2 days A left the work and next after 2 days C also left the work. Then in how much time the whole work will complete.
(ii) If A,B and C starts work together but after 3 days C left the work and next after 1 days A also left the work. Then in how much time the whole work will complete.
(iii)If A,B and C starts work together but after 3 days A left the work and B left the work 1 day before the complete of work then in how much time the whole work will complete.
(iv) If A,B and C starts work together but after 3 days A left the work and B left the work 4 day before the complete of work then in how much time the whole work will complete.
(v) A,B and c starts work together A left the work 2 days before the completion of work and B left the work 3 days before the completion of work. Then in how much time the whole work will complete?
11) A+B, B+C and C+A can complete a work in 12, 15 and 20 days respectively in how much time they together complete the whole work.
12) A+B, B+C and C+A can complete a work in 10, 12 and 20 days respectively in how much time they together complete the whole work.
13) A+B, B+C and C+A can complete a work in 12, 8 and 10 days respectively in how much time they together complete the whole work.
14) A+b and B+C can do a work in 12 days and 16 days respectively. If A work for 5 days and B work for 7 days on that work then C complete the remaining work in next 13 days. Then calculate in how much time C alone would complete the whole work?
15) A,B and C can do any work in 6 days. While B alone can do theis work in 16 and B+C in 10 days. Find in how many A+B can complete the whole work?
(a) 240/31 (b) 242/31
(c) 241/31 (d) None of these
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