Question

Which is a common denominator of 1/4 and 3/5?
Ο Α. 9
OB. 15
O C. 16
OD 20

Answer 1

D 20

Explanation:

By use of LCM

the LCM of 4 and 5 is 2 x 2 x 5=20

therefore their common denominator is 20