Question

Find all the even common factors of 16 and 20.

• A. 1, 2 and 4
• B. 2 and 6
• C. 4 and 5
• D. 2 and 4

Answer 1

The correct option is D 2 and 4

16 = 1 × 16
= 2 × 8
= 4 × 4
Factors of 16: 1, 2, 4, 8 and 16

20 = 1 × 20
= 2 × 10
= 4 × 5
Factors of 20: 1, 2, 4, 5, 10 and 20

Common factors are 1, 2 and 4.
Out of which even factors are 2 and 4.