1.  If xy =36, then which of the following is correct?
A. x : 9 = 4 : y
B. 9 : x = 4 : y
C. x :17 = y : 7
D. x : 6 = y : 6

Answer: Option A

Explanation:

xy =36
⇒ xy = 4 x 9
⇒ x/9 = 4/y
∴ x : 9 = 4 : y