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If xy =36, then which of the following is correct?

x : 9 = 4 : y
9 : x = 4 : y
x :17 = y : 7
x : 6 = y : 6

Correct Answer: x : 9 = 4 : y

Explanation:

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

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