Average
1. Find the average of 15, 20, 25, and 30.
A. 20
B. 22.5
C. 25
D. 27.5
B. 22.5
2. A student scores 80 in Math (weight=3) and 60 in Science (weight=2). What's the weighted average?
A. 66
B. 70
C. 72
D. 75
C. 72
3. The average age of 5 students is 20. If a teacher (age 40) joins, what's the new average?
A. 22
B. 24
C. 25
D. 30
C. 25
4. The average of 4 numbers is 12. If three numbers are 10, 15, and 11, what's the fourth?
A. 10
B. 12
C. 14
D. 16
B. 12
5. A car travels 60 km/h for 2 hours and 40 km/h for 3 hours. What's the average speed?
A. 45 km/h
B. 48 km/h
C. 50 km/h
D. 55 km/h
B. 48 km/h
6. The average temperature for Monday to Wednesday was 30°C, and for Tuesday to Thursday was 32°C. If Monday was 28°C, what was Thursday's temperature?
A. 30°C
B. 32°C
C. 34°C
D. 36°C
C. 34°C
7. A class of 30 students averages 12 years. If 5 students (avg. age 10) leave, what's the new average?
A. 11.5
B. 12.2
C. 12.5
D. 13
B. 12.2
8. A batsman averages 40 over 10 innings. How many runs in the 11th inning to raise the average to 45?
A. 80
B. 90
C. 95
D. 100
C. 95
9. A shop's average profit for 6 months is ₹12,000. If the next 6 months average ₹18,000, what's the yearly average?
A. ₹12,000
B. ₹14,000
C. ₹15,000
D. ₹16,000
C. ₹15,000
10. The average height of 8 people increases by 2cm when a new person joins. How much taller is the new person?
A. 14cm
B. 16cm
C. 18cm
D. 20cm
C. 18cm
11. A student averages 75 over 4 tests. To average 80, what's needed on the 5th test?
A. 80
B. 90
C. 95
D. 100
D. 100
12. Group A (10 people) averages 50kg. Group B (20 people) averages 60kg. What's the combined average?
A. 53.33kg
B. 55kg
C. 56.67kg
D. 58kg
C. 56.67kg
13. A train travels 300km at 60 km/h and 400km at 80 km/h. What's the average speed?
A. 66.67 km/h
B. 68 km/h
C. 70 km/h
D. 72 km/h
A. 66.67 km/h
14. A team's average salary is ₹50,000. If a manager (₹80,000) joins, the average becomes ₹52,000. How many people were originally in the team?
A. 10
B. 12
C. 14
D. 15
C. 14
15. What's the average of the first 10 odd numbers?
A. 9
B. 10
C. 11
D. 12
B. 10
16. The average of 5 consecutive even numbers is 16. What's the smallest number?
A. 10
B. 12
C. 14
D. 16
B. 12
17. The average of 5 numbers is 12. If one number is removed, the average becomes 10. What was the removed number?
A. 10
B. 15
C. 20
D. 25
C. 20
18. The average age of a couple is 25. After 5 years, what will be their average age?
A. 25
B. 28
C. 30
D. 32
C. 30
19. The average rainfall for 3 days is 12mm. If it rains 10mm and 14mm on two days, what's the third day's rainfall?
A. 10mm
B. 12mm
C. 14mm
D. 16mm
B. 12mm
20. A library averages 50 books per shelf. If 5 shelves average 45 books, how many books per shelf are needed on 3 new shelves to raise the overall average to 52?
A. 55
B. 58
C. 60
D. 62
D. 62