Multiple choice

Which least number should be subtracted from 427399 so that the remainder would be divisible by 15?

  1. 3

  2. 4

  3. 2

  4. 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To find what must be subtracted, calculate 427399 mod 15. Divisibility by 15 requires divisibility by both 3 and 5. For divisibility by 5, the last digit must be 0 or 5. 427399 - 4 = 427395 ends in 5. Checking divisibility by 3: 4+2+7+3+9+5 = 30, which is divisible by 3. Therefore, 427395 is divisible by 15, so subtracting 4 works.

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