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How many litres of water should be added to a 7.5 litre mixture of acid and water containing acid and water in the ratio of 1:2 such that the resultant mixture has 20% acid in it?
7.5 लीटर मिश्रण जिससे अम्ल और पानी का अनुपात 1:2 है में कितने लीटर पानी मिलाया जाना चाहिए, कि परिणामी मिश्रण में 20% अम्ल हो जाए।

A

`10`

B

`2.5`

C

`7.5`

D

`5`

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