## Direct and Inverse MCQs

The answers of questions marked with * are subject to change with time

Last Updated: 15 Aug 2022

**I spend 20 hours to clean my garden. How long will it take if 4 people with the same efficiency come to join me?**

A. 3 hours

B. 6 hours**C. 4 hours**

D. 5 hours

**Asst Punjab Planning Dept-19/Lecturer (Zoology) PHED-20**

**A man earns Rs. 7,500 in 2 weeks. What will he earn in 2 days if he works 6 days a week?**

A. Rs. 2,500

B. Rs. 1,700**C. Rs. 1,250**

D. Rs. 1,050

**Asst Special Education Dept-20**

Man earns in 12 days = Rs. 7,500

Man earns in 1 day = 7,500 / 12

Man earns in 2 days = 7,500 /12 x 2

= Rs. 1,250

**A worker is paid Rs. 2,130 for 6 days. If his total wage during a month is Rs. 9,230. Then the number of days he worked in the month are:**

A. 24**B. 26**

C. 22

D. 20

**Asst S&GAD-20**

Money paid for 6 days = Rs. 2,130

Money paid for 1 day = 2,130/6 = Rs. 355

Total money paid = Rs. 9,230

Number of days the worker worked = 9,230/355 = 26 days

**If the wages of 6 men for 15 days is Rs. 2100, then find the wages of 9 men for 12 days.**

A. Rs. 2400**B. Rs. 2520**

C. Rs. 2600

D. Rs. 2750

**Land Record Officer PBR-16**

**Six men working 8 hours a day earn Rs. 720 per week. Eight men working 6 hours a day will earn per week?**

A. Rs. 540**B. Rs. 720**

C. Rs. 960

D. Rs. 1080

**AD Forensic Science-18**

**If 10 men can construct a building in 40 days. How long will it take 20 men to do this work?**

A. 50 days

B. 40 days

C. 30 days**D. 20 days**

**AD Forensic Science-18**

**120 men are used to build a huge building in 30 days. How long will it take 80 men to do the same work?**

A. 35 days

B. 30 days**C. 45 days**

D. 40 days

**Asst PPSC-18**

**If 8 men can reap 80 hectares in 24 days, how many hectares can 36 men reap in 30 days?**

A. 400

B. 420**C. 450**

D. 480

**Crop Reporter-18**

**If a machine can place a cap on a bottle every 0.8 seconds, how many bottles can be capped in 2 hours?**

A. 8000

B. 600**C. 9000**

D. 6500

**Manager Auqaf-21**

Time taken to place one cap = 0.8 s

Total Time = 2 hrs = 2 x 60 x 60 = 7200 s

Total bottles capped in given time = 7200 / 0.8

= 72000 / 8 = 9000 bottles.

**A soap factory makes 600 units in 9 days with help of 20 machines. How many units can be made in 12 days with the help of 18 machines?**

A. 680**B. 720**

C. 760

D. 810

**SI PCD-17/Tax Inspector-18 (Guj)**

**If A and B together can complete a job in 15 days and B alone can complete it in 20 days. In how many days can A alone complete the job?**

A. 40

B. 45**C. 60**

D. 30

**AD Labour Welfare-17/Asst AH-18/Asst PESSI LHRD-21**

A and B complete the job in = 15 days

One day’s work of A+B = 1/15

B complete the job in = 20 days

One day’s work of B = 1/20

Then, A’s one day’s work

= 1/15 – 1/20

= 4-3 / 60

= 1/60

Thus, A can complete the job in = 60 days

**A can do a piece of work in 4 hours. B and C together can do it in 3 hours, while A and C together can do it in 2 hours. B alone can do in:**

A. 8 hours

B. 10 hours**C. 12 hours**

D. 14 hours

**Asst S&GAD-20**

A’s 1 hour’s work = 1/4

(B+C)’s 1 hour’s work = 1/3

(A+C)’s 1 hour’s work = 1/2

∴ C’s 1 hour’s work = 1/2 – 1/4 = 1/4

B’s 1 hour’s work = 1/3 – 1/4

= 4-3 / 12

= 1/12

Hence, B will complete the whole work in = 60 hours

**A tyre has 2 punctures. The first puncture alone would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat?**

A. 3.20 mins

B. 3.40 mins**C. 3.60 mins**

D. 3.80 mins

**Asst Livestock Regular Basis-20**

**Twelve men take 6 hours to finish a piece of work. After the 12 men have worked for 1 hour, the contractor decides to call in 8 more men. How many more hours would 20 men take to complete the remaining work?**

A. 2**B. 3**

C. 4

D. 5

**Asst S&GAD-15**

**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

**Asst Punjab Workers Welfare Board LHRD-19 (Contract Basis)**

**Ali asked 32 men to build his house in 20 days. 80% of the work got completed in just 12 days. So Ali removed some workers. Now how many persons does he need to complete the remaining work in decided time?**

A. 20**B. 12**

C. 32

D. 16

**Lecturer (Physics) PHED-20**

**5 workers, working 8 hours a day, finished painting a house in 2 days. If an identical house has to be painted completely in a day by 8 workers, how many hours should they work?**

A. 9**B. 10**

C. 11

D. 13

**Asst S&GAD-15**

**60 men can do a work in 40 days. How long will it take 40 men to complete the same work?**

A. 30 days

B. 29 days**C. 60 days**

D. 23 days

**Asst Punjab Police-20**

**39 men complete a task in 29 days. How long it will take 29 men to do the task?**

A. 29 days**B. 39 days**

C. 49 days

D. 59 days

**Punjab Treasury Deputy Acct-19 (N)**

**If 42 women can do a piece of work in 18 days. How many women would be required to do the same work in 21 days?**

A. 28**B. 36**

C. 40

D. 33

**Asst PDMA BOR-21**

**If 60 women spin 48 kg of cotton by working 8 hours daily. How much cotton will 30 women spin by working 12 hours daily?**

A. 50 kg

B. 24 kg**C. 36 kg**

D. 60 kg

**Asst DMD BOR-21**

**12 water pumps can make a water tank empty in 20 minutes. But 2 pumps are out of order. How long will the remaining pumps take to make the tank empty?**

A. 20 minutes**B. 24 minutes**

C. 28 minutes

D. 32 minutes

**Asst Special Education Dept-20**

Time taken by 12 water pumps to make the water tank empty = 20 minutes

Water pumps out of order = 2

Remaining water pumps in working condition = 12 – 2 = 10

Time taken by 10 water pumps to make the water tank empty = y minutes

12 x 20 = 10 x y

240 = 10y

y = 240 / 10

y = 24 minutes

**A fort had provision of food for 150 men for 45 days. After 10 days. 25 men left the fort. The number of days for which the remaining food will last is:**

A. 29 1/5

B. 37 1/4**C. 42**

D. 47

**Asst S&GAD-20**

Fort had provision of food for 150 men for 45 days

After 10 days men left = 25

Remaining men in the fort = 150 – 25 = 125

Food left for the 125 men = x days

125 × y = 150 × 35

125y = 5250

y = 5250 ÷ 125

y = 42 days