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The ratio of the present ages of Mr Dhuryodhana and Mr Dhushyasna is ` 5 : 4`. Which of the following cannot be the ratio of their ages 5 years ago?
A. ` 4 : 3`
B. ` 3 :2`
C. ` 9 : 7`
D. ` 8 : 7`

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Correct Answer - D
The rato of the present ages of Mr Dhuryodhana and Mr Dhushyasana is ` 5 : 4`.
The given ratio is the ratio of greater inequality.
` :. ` The ratio of their ages k years ago is greater than the ratio of their ages now.
But ` 8 : 7` is less than ` 5 : 4`.

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