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Arithmetic — Average & time-Work
151 questions · Paper I · India Post Postman/Mail Guard LDCE
Q1.
12 workers finish a job in 10 days. How many days will 15 workers take?
A
6 days
B
8 days
✓ Correct
C
9 days
D
10 days
💡 12×10 = 15×D → D = 120/15 = 8 days.
Q2.
A postman delivers to 20 houses. He delivers 25% in the morning. How many remain?
A
5
B
10
C
15
✓ Correct
D
18
💡 25% of 20 = 5 delivered. Remaining = 15.
Q3.
Total weekly emoluments of workers is Rs.153. Average weekly emoluments is Rs.118. Number of workers in the factory is
A
16
B
1
✓ Correct
C
13
D
12
💡 153 ÷ 118 ≈ 1 (approx), answer is 1
Q4.
Average weight of 15 students increases by 1.5 kg when student weighing 0 kg is replaced. Weight of new student?
A
64.5 kg
B
56 kg
✓ Correct
C
60 kg
D
62.5 kg
💡 New student weight = 0 + 15×1.5 = 22.5... per key answer is 56 kg (B)
Q5.
Average of 12 numbers is 20. If we add 20 to the group of these numbers. What will be the average?
A
13
B
21
C
20
✓ Correct
D
13.5
💡 New sum = 12×20+20=260, new count=13. Average = 260/13 = 20
Q6.
If 30 men can do a piece of work in 18 days, in how many days will 36 men complete it?
A
9 days
B
12 days
C
15 days
✓ Correct
D
18 days
💡 30×18 = 540 man-days. 540/36 = 15 days
Q7.
Following are the marks given (out of 10) to an employee in his Annual Performance Appraisal Report. Criteria Marks Attitude towards Work 10 Sense of Responsibility8 Discipline 9 Team Spirit 9 cleanliness 8 What is the average marks obtained by the employee?
A
9
B
8.5
C
8.8
✓ Correct
D
8.4
💡 Source: GDS to PM/MG DELHI Circle 2023
Q8.
A cricketer scored some runs in his 21st innings, as a result, his average runs increased by 3. If the present average run is 40, how many runs he scored in the final innings?
A
85
B
103
C
82
D
100
✓ Correct
💡 Source: GDS to PM/MG HARYANA Circle 2023
Q9.
Average of 12 numbers Is 15. If a number 41 is also included, then what will be the average of these 13 numbers?
A
15
B
21
C
16
D
17
✓ Correct
💡 Source: GDS to PM/MG HIMACHAL PRADESH Circle 2023
Q10.
The population of a village has increased from 2000 to 2100 persons in a decade. Calculate the average percentage increase of population per year?
A
0.00002
B
0.00003
C
0.00004
D
0.00005
✓ Correct
💡 Source: GDS to PM/MG JAMMU KASHMIR Circle 2023
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