If (2)/(x) + (3)/(y) = (9)/( xy ) and (4...

If `(2)/(x) + (3)/(y) = (9)/( xy ) and (4)/(x) + (9)/(y) = (21)/(xy) ` where `x ne 0 and y ne 0,` that what is the value of `x + y ` ?

A

2

B

3

C

8

D

4

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The correct Answer is:

C

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