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If x,y and z are three numbers such that x+y = 13, y+z = 15 and z+x = 16, then the value of `(xy+xz)/(xyz)` is :
यदि x,y तथा z तीन ऐसी संख्याएँ है कि x+y = 13, y+z = 15 तथा z+x =16 है, तो `(xy+xz)/(xyz)` का मान ज्ञात करें ।

A

`5/18`

B

`5/36`

C

`18/5`

D

`36/5`

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