Multiple choice general knowledge math & puzzles

A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:

  1. 81

  2. 42

  3. 18

  4. 24

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Checking the options: for 24, the product of digits is 2*4=8. Adding 18 to 24 gives 42, which is the reverse of 24. This satisfies both conditions of the problem.