If x is a multiple of 15 and 20, which of the following must also be a divisor of x? I. 5 II. 60 III. 100

Answer Choices

Correct answer marked below

I only

I and II

Correct

II and III

II only

I, II, and III

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Explanation

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Official Explanation

Official

Since x is a multiple of both 15 and 20, we can find their least common multiple (LCM) to determine what must divide x. The LCM of 15 and 20 is 60. Therefore, any number that divides 60 must also divide…

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Comments

priyankaMar 20, 2025

Good question

BoniMay 6, 2024

thanksss

JasonAug 24, 2024

Thank you very much!

What this question tests

What it tests

Your understanding of divisibility rules, least common multiples, and greatest common factors.

Common trap

Forgetting that 1 is not prime and that every integer divides 0.