Multiple choice

In what ratio must 25% of alcohol be mixed with 50% of alcohol to get a mixture of 40% strength alcohol? 25% अल्कोहल को 50% अल्कोहल में किस अनुपात में मिलाया जाय ताकि प्राप्त मिश्रण में 40% अल्कोहल हो जाये?

  1. 1 : 2

  2. 2 : 1

  3. 2 : 3

  4. 3 : 2
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C Correct answer
Explanation

Using alligation method: To find the ratio of 25% and 50% alcohol to get 40%, calculate the differences from the target. 50% - 40% = 10 parts of the 25% solution, and 40% - 25% = 15 parts of the 50% solution. The ratio is 10:15, which simplifies to 2:3. Therefore, 25% alcohol and 50% alcohol must be mixed in the ratio 2:3 to get a 40% mixture.

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