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In a 25 litre mixture of `O_(2)andN_(2),O_(2)` is `36%` . Some part of mixture is replaced by `N_(2)` and this process was repeated once again . If at the end `O_(2)` become `9%` then find the part of mixture taken out in one process ?

A

`12 . 5`

B

`13 . 5`

C

`14 .5`

D

`11 . 5`

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