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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