Selected MCQ

Current Question
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.
Related Question 1
Three numbers are co-prime. The product of the first two is 551. Find the third.
  • A. 75
  • B. 81
  • C. 85
  • D. 89
Correct Answer: C
Explanation:
Factorization approach.
Related Question 2
Three numbers: 5/7 of the first equals 48% of the second, and the second is 1/9 of the third. Find first.
  • A. 168
  • B. 84
  • C. 42
  • D. 21
Correct Answer: D
Explanation:
Solve the proportion.
Related Question 3
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 4
Three years ago, the average age of 6 members was 19. Find the present age of a boy.
  • A. 1 year
  • B. 1.5 years
  • C. 2 years
  • D. 2.5 years
Correct Answer: A
Explanation:
Total age difference method.
Related Question 5
Three consecutive odd integers have a sum such that the last two exceed the first by 13. Find numbeRs.
  • A. 9,11,13
  • B. 11,13,15
  • C. 13,15,17
  • D. 7,9,11
Correct Answer: D
Explanation:
Solve a linear relation.