If an integer 'k' is divisible by 2, 5, and 13, what is the next number after…

2023

If an integer 'k' is divisible by 2, 5, and 13, what is the next number after 'k' that is divisible by all three numbers?

  1. A.

    k+13

  2. B.

    2k+13

  3. C.

    2k

  4. D.

    k+130

Attempted by 1 students.

Show answer & explanation

Correct answer: D

Concept: If a number must be divisible by several given integers at once, then consecutive numbers satisfying that condition are spaced apart by exactly the Least Common Multiple (LCM) of those integers — the very next such number after any qualifying value is obtained by adding their LCM to it.

Application:

  1. k is divisible by 2, 5, and 13, so k is already a common multiple of all three.

  2. 2, 5, and 13 are pairwise coprime (all prime), so their LCM is their direct product: LCM(2, 5, 13) = 2 × 5 × 13 = 130.

  3. The next integer after k that is again divisible by 2, 5, and 13 must be k plus this LCM, since any smaller positive addition cannot be guaranteed divisible by all three for every possible k.

Cross-check: Taking k = 260 (itself divisible by 2, 5 and 13), the next common multiple is 390 = 260 + 130, confirming the step size of 130 — notice this is also distinct from 2k = 520, a different, larger value.

Result: The next number divisible by 2, 5 and 13 after k is k + 130.

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