Time and Work Questions

Multiple choice
  1. 60

  2. 44

  3. 78

  4. 75

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let x be the number of people. x * 40 = (x + 45) * 25. 40x = 25x + 1125. 15x = 1125. x = 75.

Multiple choice
  1. 1:3

  2. 3:1

  3. 6:4

  4. 7:5

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

16 women * 6 days = 96 woman-days. 8 men * 4 days = 32 man-days. Since the total work is the same, 96 woman-days = 32 man-days. Therefore, 1 man = 3 women. The ratio of efficiency (man:woman) is 3:1.

Multiple choice
  1. 8 நாட்கள்/ 8 Days

  2. 4 நாட்கள்/ 4 Days

  3. 2 நாட்கள்/ 2 Days

  4. 1 நாள்/ 1 Day

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work = Men * Hours * Days. 4 * 4 * 4 = 64 units of work. If 8 men work 8 hours a day, 8 * 8 * D = 64. 64 * D = 64, so D = 1.

Multiple choice
  1. 5 நாட்கள்/5 days

  2. 6 நாட்கள்/ 6 days

  3. 7 நாட்கள்/7 days

  4. 8 நாட்கள்/8 days

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

4M = 7B, so 1M = 7/4 B. 12M + 8B = 12(7/4)B + 8B = 21B + 8B = 29B. Since 7B takes 29 days, 29B takes (7 * 29) / 29 = 7 days.

Multiple choice
  1. 6 நாட்கள்/days

  2. 4 நாட்கள்/4days

  3. 8 நாட்கள்/8days

  4. 7 நாட்கள்/7days

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total work = 45 * 16 = 720 man-days. After 6 days, work done = 45 * 6 = 270. Remaining work = 720 - 270 = 450. New number of men = 45 + 30 = 75. Days to finish = 450 / 75 = 6 days.

Multiple choice
  1. 54 நாட்கள்/ 54 days

  2. 64 நாட்கள்/64 days

  3. 44 நாட்கள் / 44days

  4. 108 நாட்கள்/108 days

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

2M = 6W = 4Y = 1/99 of the work per day. So 1M = 1/198, 1W = 1/594, 1Y = 1/396. Combined rate = (1/198 + 1/594 + 1/396) = (6+2+3)/1188 = 11/1188 = 1/108. Time taken = 108 days.

Multiple choice
  1. 12 1/4

  2. 12 1/2

  3. 11 1/2

  4. 11 1/4

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using the formula (M1 * D1 * H1) = (M2 * D2 * H2), we have 20 * 10 * 7 = 14 * D2 * 8. This simplifies to 1400 = 112 * D2, so D2 = 1400 / 112 = 12.5 days.

Multiple choice
  1. 15

  2. 10

  3. 8

  4. 16

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using the work-man-day formula (M1*D1 = M2*D2), 6 * 20 = M2 * 15. M2 = 120 / 15 = 8.

Multiple choice
  1. 15 நாட்கள்/ 15 days

  2. 17 நாட்கள்/ 17 days

  3. 18 நாட்கள்/ 18 days

  4. 20 நாட்கள்/ 20 days

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using the work formula M1 * D1 = M2 * D2: 150 * 12 = 120 * D2. D2 = (150 * 12) / 120 = 150 / 10 = 15 days.

Multiple choice
  1. 10 நாட்கள்/10 days

  2. 20 நாட்கள்/20 days

  3. 25 நாட்கள்/ 25 days

  4. 30 நாட்கள்/ 30 days

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Four men's work rate equals seven women's work rate, and either group completes the job in 90 days. Eight men have twice the four-men rate, so eight men and seven women together work at 3/90 of the job per day. Their completion time is therefore 90/3 = 30 days.

Multiple choice
  1. 24

  2. 32

  3. 36

  4. 40

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let M and W be daily work of a man and woman. 8(4M + 6W) = 10(3M + 7W) => 32M + 48W = 30M + 70W => 2M = 22W => M = 11W. Total work = 8(4(11W) + 6W) = 8(50W) = 400W. 10 women take 400W / 10W = 40 days.

Multiple choice
  1. 8 நாட்கள்/ 8 days

  2. 6 நாட்கள்/ 6 days

  3. 12 நாட்கள்/ 12 days

  4. 10 நாட்கள்/ 10 days

  5. இவற்றில் ஏதுமில்லை/None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an inverse proportion problem. (5 people * 24 days) = (12 people * X days). 120 = 12X, so X = 10 days.

Multiple choice
  1. a) Quantity I> Quantity II

  2. b) Quantity I < Quantity II

  3. c) Quantity I ≥Quantity II

  4. d) Quantity I ≤Quantity II

  5. e) Quantity I = Quantity II or No relation

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If B's efficiency is 1 unit/day, A's efficiency is 1.25 units/day. Quantity I (x) = (5/6) / 1.25 = (5/6) / (5/4) = 4/6 = 2/3. Quantity II (y) = (4/5) / 1 = 4/5. Since 2/3 < 4/5, Quantity I < Quantity II.

Multiple choice
  1. 6 days

  2. 9 days

  3. 7 days

  4. 5 days

  5. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let A, M, R, Ra be the work rates. A+M+R = 1/10, M+Ra = 1/15, R+Ra = 1/20, M+R = 1/18. We need A+M+Ra. From the equations, (A+M+R) - (M+R) = A = 1/10 - 1/18 = 4/90 = 2/45. Then M+Ra = 1/15. So A+M+Ra = 2/45 + 1/15 = 5/45 = 1/9. The time taken is 9 days.