Multiple choice

In which ratio water is mixed with milk so that by selling mixture at the cost price he may gains 20\%?

  1. 1 : 2

  2. 2 : 3

  3. 5 : 1

  4. 1 : 4

  5. 6 : 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To gain 20% by selling at cost price, 20% of the mixture must be water (free). Let milk be M and water be W. Selling at CP means: CP(M+W) = SP(M+W) = 1.2×CP(M). This gives: CP(M+W) = 1.2×CP(M), so M+W = 1.2M, meaning W = 0.2M. Therefore W:M = 0.2:1 = 1:5, so water:milk = 1:5 ✓

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