Multiple choice general knowledge math & puzzles

There is a number that is 5 times the sum of its digits. What is this number?

  1. 25

  2. 35

  3. 45

  4. 55

  5. 65
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the number be 10a + b (two-digit number). Condition: 10a + b = 5(a + b), so 10a + b = 5a + 5b, giving 5a = 4b. Testing integer values: a=4, b=5 gives 45. Checking: 4+5=9, 9×5=45. Option C is correct.

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