Multiple choice

In what ratio should Lassi worth Rs. 15 per kg be mixed with Lassi worth Rs. 20 per kg so that the average price of the mixture may be Rs. 17 per kg?

  1. 6 : 5

  2. 3 : 1

  3. 3 : 2

  4. 7 : 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using alligation: (Price 2 - Mean) / (Mean - Price 1) = (20 - 17) / (17 - 15) = 3 / 2.

AI explanation

Using the rule of alligation, we write the prices of the two varieties, 15 and 20, and the mean price of 17 in the middle. The ratio of the quantity of the first variety to the second variety is given by (20 minus 17) to (17 minus 15). Calculating these differences gives 3 to 2. The Lassi varieties must be mixed in the ratio 3 to 2.

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