Allied & ICAR Exam Bank • ALLIED_1888 MCQ • 2 Marks

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

In a two-digit number, the unit digit is twice the tens digit. If 18 is added to the number, the digits are reversed. The number is:

Options:

  • (A) 24
  • (B) 36
  • (C) 12
  • (D) 48

Answer Key:

A

Step-by-Step Solution & Explanation

Let number be $10x + y$. $y = 2x$. $10x + y + 18 = 10y + x \implies 9y - 9x = 18 \implies y - x = 2$. With $y = 2x$, $2x - x = 2 \implies x = 2, y = 4$. Number is 24.
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