Question:If `1/5 : 1/x = 1/x : 1/(1.25)`, the value of `x` is : 

A `1.5` 
B `2` 
C `2.5` 
D `3.5` 

+ Answer
C 

+ Explanation
`1/5 xx 1/(1.25) = 1/x^2`

`iff` `x^2 = 5 xx 1.25`

`iff` `x^2 = 6.25`

`iff` `x = 2.5`.

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Md. Habib Ullah

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