Selected MCQ

Current Question
If the average of 5 numbers is 20, their sum is ____.
  • A. 80
  • B. 90
  • C. 100
  • D. 120
Correct Answer: C
Explanation:
Sum = average × count.
Related Question 1
The sum of five numbers is 655. The average of the first two is 85. Find the sum of the last three.
  • A. 180
  • B. 170
  • C. 190
  • D. 175
Correct Answer: A
Explanation:
Subtract known sum.
Related Question 2
If the average of 10 numbers is 40, what is the total sum?
  • A. 400
  • B. 450
  • C. 350
  • D. 420
Correct Answer: A
Explanation:
Sum = average × count = 400.
Related Question 3
If the average of 4 numbers is 25, what is their total?
  • A. 50
  • B. 75
  • C. 100
  • D. 125
Correct Answer: C
Explanation:
Total = 25×4 = 100.
Related Question 4
The average of 7 numbers is 49. If one number is replaced by 70, the average becomes 50. What was the original number?
  • A. 40
  • B. 42
  • C. 43
  • D. 45
Correct Answer: B
Explanation:
Difference in total = 7 ⇒ original = 42.
Related Question 5
The average of three numbers is 45. If two numbers are 40 and 50, what is the third?
  • A. 35
  • B. 40
  • C. 45
  • D. 55
Correct Answer: C
Explanation:
Total = 135 ⇒ third = 45.