Selected MCQ

Current Question
Three cubes of sides 9, 12, and 15 cm are melted to form a new cube. Find its side.
  • A. 21 cm
  • B. 19 cm
  • C. 32 cm
  • D. 18 cm
Correct Answer: D
Explanation:
Total volume = cube of new side.
Related Question 1
The perimeters of two squares are 48 cm and 20 cm. Find the difference in their sides.
  • A. 15√2 cm
  • B. 13√2 cm
  • C. 16√2 cm
  • D. 17√2 cm
Correct Answer: B
Explanation:
Side = perimeter/4; difference leads to 13√2 cm.
Related Question 2
A rectangular field is fenced on three sides, leaving one side of 20 ft open. If the area is 680 sq ft, what is the length of the fence?
  • A. 34 ft
  • B. 40 ft
  • C. 68 ft
  • D. 88 ft
Correct Answer: D
Explanation:
Solve dimensions and add three sides.
Related Question 3
Total area of 64 squares is 400 cm². Find the side of the big square.
  • A. 17 cm
  • B. 20 cm
  • C. 23 cm
  • D. 26 cm
Correct Answer: D
Explanation:
Total side calculation.
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 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.