Query about Question 1 from "PrepSwift: Multiples" [3624]

GRE GRE Quant Problem Solving
1

Link: https://prepswift.gregmat.com/quizzes/quiz/prepswift-multiples (Question 1)

how is 0 a multiple of every integer if it cannot be multiplied to something to give that integer as a result? If 0 was a multiple of 10, wouldn’t you be able to multiply 0 with something to get a result of 10? Which is not possible because 0 multiplied by anything is 0

2

You have it the other way around.

b is a multiple of a if b = ka for some integer k.

So, 0 is a multiple of 10 because 0 = 10 k, where k = 0.