Selected MCQ

Current Question
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 1
In a number, the hundreds digit is 2 more than the tens digit. Find the number.
  • A. 975
  • B. 753
  • C. 642
  • D. None of these
Correct Answer: D
Explanation:
Insufficient data for a unique solution.
Related Question 2
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 3
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 4
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 5
Three flags of different coloRs. Number of signals using 1 or more flags is ____.
  • A. 6
  • B. 9
  • C. 15
  • D. 18
Correct Answer: C
Explanation:
Total combinations excluding empty = 2³ −1.