Question:If `0.4 : 1.4 :: 1.4 : x`, the value of `x` is : 

A `49` 
B `4.9` 
C `0.49` 
D `0.4` 

+ Answer
B 

+ Explanation
`0.4 xx x = 1.4 xx 1.4`

`iff` `x = (1.4 xx 1.4)/0.4`

 `= (14 xx 14)/40`

 `= 4.9`.

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Md. Habib Ullah

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