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The ratio of milk and water in a mixture...

The ratio of milk and water in a mixture is 7 : 5. We withdraw 9 lt mixture and added same quantity of water to the mixture then ratio becomes 1 : 1 find the initial quantity of milk.

A

`36(3)/4"lt"`

B

`40"lt"`

C

`36"lt"`

D

`30"lt"`

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