A 40 - litre mixture contains 25% alcohol and 75% water. If 10 litres of water are added to the mixture, the percentage of alcohol in the new mixture is:

This question was previously asked in
SSC CGL 2023 Tier-I Official Paper (Held On: 25 Jul 2023 Shift 4)
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  1. 27%
  2. 18%
  3. 20%
  4. 25%

Answer (Detailed Solution Below)

Option 3 : 20%
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PYST 1: SSC CGL - General Awareness (Held On : 20 April 2022 Shift 2)
25 Qs. 50 Marks 10 Mins

Detailed Solution

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Given:

The total quantity of mixture = 40 litres

Calculation:

Alcohol present in mixture = 40 × 25% = 10 litres

Water present in mixture = 40 - 10 = 30 litres

10 litres of water is added to the mixture.

New quantity of water = 30 + 10 = 40 litres

Percentage of alcohol in mixture = (10 × 100)/50 = 20% 

∴ The correct answer is 20%.

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