## Amar Sir is teaching live on Unacademy Plus

A renowned faculty of Objective Mathematics, Personal Interview/GD, General Studies, Indian History An experience of 24 yrs of teaching at Jamshedpur, Ranchi, Bokaro [Jharkhand], Sambalpur [Odisha]. Thousands of successful students in Bank/SSC/Railway/Civil Services unacademy 102 1040 152K Courses Lessons Followers Life time views 910 K Amar Sir "Math Dikhta Hai" Follow me on Unacademy: https://unacademy.com/user/amar.singh963

IBPS PO SBI PO Time and Work unacadem Amar Sir

SBI PO AND IBPS PO MATHEMATICS Time and Work unacade

2 2

1. Q: 20 men can prepare 40 toys in 24 days working 18 hours a day.lhen in how many days can 36 men prepare 48 toys working 16 hours a day. (a) 16 days (b) 12 days (c) 21 days (d) 18 days (e) None of thesee Solution: First Method Second Methoad M D HW 20 24 18 40 20 x 24 x 18 x 48 36 x D2 x 16x 40 36 ? 16 48 D2 18 days Ans. Third Method: 24 days x Xx 20-18-48 20 24 18 48 36 16 40 36 ? 16 40 18 days Ans. ?-18 days Ans.

2. (i) Q: 5 men can prepare 10 toys in 6 days working 6 hours a day. Then in how many days can 12 men prepare 16 toys working 8 hours a day. (a) 4 days (b) 6 days (c) 3 days (d) 8 days (e) None of these 10 6 2.

2. (ii) Q: 10 men can complete a piece of work in 15 days and 15 women and complete the same work in 12 days. If all the 10 men and 15 women work together, in how many days will the work get completed? (a) 6 days (b)2 2/3 days (G) 6/ day (d) 6 1/3 days (e) None of these 7 y 27 5+12

3. Q: A, B and C can do a piece of work in 6, 12 and 24 days respectively. They altogether will complete the work in (a)3 3/7 days (b)7/24 days (c) 4 4/s days (d) /24 days (e)None of these 2 4 442+ 2 6 3 2nd Melhad L. CM.646,122-24:24 -Toka/ work-Z4unh

4. Q: A and B together can do a piece of work in 6 days and A alone can do it in 9 days. In how many days can B alone do it? (a) 7 days (b) 19 days (e) 18 days (d) 10 days (e) None of these 4 01 9- 6

5. Q: I can finish a work in 15 days at 8 hrs a day. You can finish it in 6 days at 9 hrs a day. Find in how many days we can finish it working together 10 hours a day. (a) 8 days 2 3 (b) 4 days (c) 6 days (d) 9 days (e) None of these Solution: 15x8= 120 hrs and 6-x 9 = 60 hrs First Method: Y - 120x60 +y 120+60 = 40 hrs = 4 days at 10 hrs/day Ans. Second Method:-+ work/hr, so whole work in 40 hours 12o 60 40 = 4 days at 10 hrs/day Ans.

8. Q: A is thrice as fast as B, and is therefore able to finish a work in 60 days less than B. Find the time in which they can do it working together. (a) 22.5 days (b) 25 days (c) 23 days (d) 19 days (e) None of these A B 22.5 30x 94 22 3 daus ime l 11 X1130 120 30 2: 30 + 90 30d 90 b "

11.Q:If 3 men or 4 women can reap, a field in 43 days, how long will 7 men and 5 women take to reap it? (a) 12 days (b) 14 days (c) 15 days (d) 18 day (e) None M (or w) Daus 24x3 12 days

12. Q: 1 men or 2 women or 3 boys can do a work in 44 ays.Then in how many days will 1 man, 1 woman an boy do the work? (a) 26 days (b) 19 days (c) 18 days (d) 24 days (e) None of these 2 2. 2 2 2 24 dalh

13. Q: A man or a woman or a boy can do a job in 20 days, 30 days or 60 days respectively. How many boys must assist 2 men and 8 women to do the work in 2 days? (a) 6 boys (b) 10 boys (c) 8 boys (d) 5 boys (e) None 3 6 IM313 1 (B) 2 day 30 boys 22 bsy 6B +16B-22B

14. Q:6 men and 3 boys working together can do 5 times as much work per hour as a man and a boy together. Compare the work of a man with that of a boy. (a) 2:1 (b)3:1(c)3:2 (d)4:1(e) None of these IM28 2. 2 1

18. Q: A certain number of men can do a work in 60 days. If there were 8 men more it could be finished in 10 days less. How many men are there? (a) 42 men (b) 50 men (c) 40 men (d) 35 men (e) None of these =40men

20 Q: There is a sufficient food for 400 men for 31 days. After 28 days, 280 men leave the place. For how many days will the rest of the food last for the rest of the men? (a) 6 days (b) 7 days (c) 10 days (d) 15 days (e) None these 400 .280 M 400M 20 M 28on 10 124 n 3 A-

22. Q: 38 men working 6 hours a day can do a work in 12 days. Find the no. of days in which 57 men working 8 hours a day can do twice the work. Assume that two men of the first group do as much work in 1 hour as 3 men of the second group do in 1.5 hour. (a) 20 days (b) 27 days (c) 14 days (d) 17 days (e) None of these Solution: First Method Second Method 4.5x38 x12 x6X2-2x57xD.x8x1 4.5 38 12 6 1 D.- 27 days Ans. E:2-3x1.5:2x1-4.5:2]2 57 ?8 2 ThirdMethod:-12 days. 384562 Third Method: -12 daysx 4.5 x 38 x 12 6x2 57 2 8 1 2 57 ? 8 1 - 27 days Ans. 27 days Ans.

SBI PO AND IBPS PO MATHEMATICS Time and Work unacade

d/w