Question

Which is the common factor of 20 and 25?

• A. 5
• B. 4
• C. 3
• D. 7

Answer 1

The correct option is A 5

Factors of 20 = 2 $\times$ 2 $\times$ 5.
and that of 25 = 5 $\times$ 5.
Hence common factor of 20 and 25 is 5.