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Find the smallest number which when increased by 5, divisible by 6, 9, 15, 20 and 24?

Correct answer: B. 355

  • A. 344
  • B. 355
  • C. 366
  • D. 377

Explanation

The least common multiple of 6, 9, 15, 20 and 24 is 360, so the number increased by 5 must be 360. Therefore, the number is 360 - 5 = 355. A student may choose 344 by checking only some divisors instead of using their common multiple.

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