Question:What is the ratio whose terms differ by `40` and the measure of which is `2/7` ? 

A `16 : 56` 
B `10 : 50` 
C `20 : 70` 
D `36 : 76` 

+ Answer
A 

+ Explanation
`x/(x + 40) = 2/7`

`iff 7x = 2x + 80`

`iff x = 16`.

`:.`The ratio is `16 : 56`.

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Md. Habib Ullah

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