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The ratio of present ages of X and Y is 4:5. Which of the following can't be the ratio of ages of X and Y, 20 years ago ?

Correct Answer: 9 : 10

Explanation:

The ratio of X and Y ages at present is 4:5. 


Then, the ratio 20 years ago will not be more than the ratio at present.


So, from the options 9:10 is not satifying => its ratio is 0.9 which is greater than presnt ratio of 0.8.


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