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The ratio of the present ages of Ram and Shyam is ` 3 : 2`. Which of the following cannot be the ratio of their ages 20 years ago?
A. ` 8 : 5`
B. ` 17 : 10`
C. ` 9 :5`
D. ` 7 : 5`

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Correct Answer - D
Let their present ages be 3x and 2x years.

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