How many litres of water should be added to a 7.5 litre mixt

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SSC CGL Tier-2 9-March-2018 Maths Shift-2
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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?

[SSC CGL Tier-2 9-March-2018 Maths Shift-2]

A 10

B 2.5

C 7.5

D 5