Question : If solution A contains 10% acid and solution B contains 30% acid, what ratio of solution A to solution B should be mixed to obtain a mixture with 25% acid?
Option 1: 1 : 2
Option 2: 3 : 1
Option 3: 1 : 3
Option 4: 2 : 1
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Correct Answer: 1 : 3
Solution :
Given:
A contains 10% acid, solution B contains 30% acid and the mixture contains 25% acid.
Using the rule of alligation, we get,
So, the required ratio = 5 : 15 = 1 : 3
Hence, the correct answer is 1 : 3.
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