Question

Which of the following is a non-prime factor of 70? Select one: A. 5 B. 7 C. 10 D. 15

Answer 1

C. 10

Explanation:

by deduction, 5 and 7 are prime numbers and 15 is not a multiple of 70, therefore the answer must be 10 as it is a non-prime number and is a factor of 70 (I.e. 10 and 7)

Answer 2

a non prime factor of 70 is 10

the answer is c.

10 is a multiple of 70