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Question

A mixture of 150 litres contains acid and water in the ratio 2:3. If 30 litres of the mixture is replaced with water, what will be the percentage of acid in the final mixture?

This question was previously asked in
SSC CGL 2025 Tier 1 Question Paper (25-Sep-2025) (Shift 3)
The correct answer is
32%

Initial Mixture Composition

The total volume of the mixture is 150 litres.

The ratio of acid to water is 2:3.

Total ratio parts = 2 + 3 = 5.

  • Initial volume of acid = \(\frac{2}{5} \times 150\) = 60 litres.
  • Initial volume of water = \(\frac{3}{5} \times 150\) = 90 litres.

Mixture Replacement Calculation

30 litres of the mixture are removed.

  • Amount of acid removed = \(\frac{2}{5} \times 30\) = 12 litres.
  • Amount of water removed = \(\frac{3}{5} \times 30\) = 18 litres.

After removal:

  • Remaining acid = 60 - 12 = 48 litres.
  • Remaining water = 90 - 18 = 72 litres.
  • Remaining total volume = 48 + 72 = 120 litres.

Final Mixture Composition

30 litres of water are added to the remaining mixture.

  • Final acid volume = 48 litres.
  • Final water volume = 72 + 30 = 102 litres.
  • Final total volume = 48 + 102 = 150 litres.

Final Acid Percentage

Calculate the percentage of acid in the final mixture:

Percentage of Acid = \(\frac{\text{Final Acid Volume}}{\text{Final Total Volume}} \times 100\)

Percentage of Acid = \(\frac{48}{150} \times 100\)

Percentage of Acid = \(0.32 \times 100\) = 32%

The final percentage of acid in the mixture is 32%.

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Important Questions from Mixture and Alligation

  1. My father is presently 25 years older than me. The sum of our ages 5 years ago was 39 years. Find my present age.

  2. Rice worth ₹43/kg and ₹67/kg are mixed with a third variety in the ratio 2 : 1 : 5. If the mixture is worth ₹96/kg, the price (in ₹) of the third variety of rice per kg will be:

  3. 42 litres of milk at ₹25 per litre is mixed with 28 litres of milk at ₹40 per litre. Find the average price of the mixture.

  4. 15 kg of ₹10 per kg wheat is mixed with 5 kg of another type of wheat to get a mixture costing ₹30 per kg. Find the price (per kg) of the costlier wheat.

  5. If a + b + c = 0, then the value of (a² + b² + 2ab) is equal to:

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