Free Practice Question
PS · Problem Solving
655-705
Divisibility/Multiples/Factors
What is the count of positive integers from 30 to 140, inclusive, whose digital sum is a multiple of 7?
Answer Choices
Correct answer marked belowA
6
B
9
14
Correct
D
15
E
18
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Explanation
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Official Explanation
Official
To find the digital sums of the integers from 30 to 140, we can calculate the sums of their digits. The numbers that yield a digital…
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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.
Details
Difficulty
655-705
Type
PS
Category