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

Question : A container contains a 20 L mixture in which there is 10% sulphuric acid. Find the quantity of sulphuric acid to be added to it to make the solution contain 25% sulphuric acid.

Option 1: 2 L

Option 2: 3 L

Option 3: 4 L

Option 4: 5 L

Question : A mixture of acid and water contains 20% acid. When 10 litres of water is added to the mixture, then the percentage of acid becomes 15%. What is the original quantity of the mixture?

Option 1: 30 litres

Option 2: 25 litres

Option 3: 40 litres

Option 4: 35 litres

Question : Mixture A contains chocolate and milk in the ratio 4 : 3 and mixture B contains chocolate and milk in the ratio 5 : 2. A and B are taken in the ratio 5 : 6 and mixed to form a new mixture. The percentage of chocolate in the new mixture is closest to:

Option 1: 35%

Option 2: 69%

Option 3: 31%

Option 4: 65%

Question : 20 litres of a mixture contains 20% alcohol and the rest is water. If 4 litres of water is mixed in it, the percentage of alcohol in the new mixture will be:

Option 1: $33\frac{1}{3}\%$

Option 2: $16\frac{2}{3}\%$

Option 3: $25\%$

Option 4: $12\frac{1}{2}\%$

Question : In a mixture of 25 litres, the ratio of milk to water is 4 : 1. Another 3 litres of water is added to the mixture. The ratio of milk to water in the new mixture is:

Option 1: 5 : 1

Option 2: 5 : 2

Option 3: 5 : 3

Option 4: 5 : 4