Selected MCQ

Current Question
A two-digit number has a product of 8, and the digits are reversed, resulting in a difference of 18. What is the number?
  • A. 18
  • B. 24
  • C. 42
  • D. 81
Correct Answer: B
Explanation:
Only 24 satisfy conditions.
Related Question 1
Sum of digits of a two-digit number is 12, and the difference is 6. Find the number.
  • A. 93
  • B. 39
  • C. 75
  • D. Either (a) or (b)
Correct Answer: D
Explanation:
Both 93 and 39 satisfy conditions.
Related Question 2
The tens digit of a two-digit number is 2 more than the units digit. The number is 7 times the sum of its digits. Find the units digit.
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Correct Answer: B
Explanation:
Let the unit digit = x, solve Equation.
Related Question 3
Sum of two numbers is 25, and the difference is 13. Find product.
  • A. 104
  • B. 114
  • C. 315
  • D. 325
Correct Answer: B
Explanation:
Solve simultaneous equations.
Related Question 4
If the difference of two numbers is 12 and their product is 180, the numbers are ____.
  • A. 6 and 30
  • B. 10 and 18
  • C. 12 and 15
  • D. 9 and 20
Correct Answer: B
Explanation:
Solve x² − 12x − 180 = 0 → roots = 18 and 10.
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.