Multiple choice

The concentration of three milk solutions A, B and C are 10%, 20% and 30% respectively. They are mixed in the ratio 2: 3: N resulting in a 23% concentration solution. Find N.

  1. 7

  2. 6

  3. 5

  4. 4

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using allegation: 10%, 20%, and 30% solutions mixed in ratio 2:3:N to get 23%. Setup: (2×10 + 3×20 + N×30)/(2+3+N) = 23. Solving: (20 + 60 + 30N)/(5+N) = 23, so 80 + 30N = 115 + 23N, giving 7N = 35, N = 5. Option C is correct. Options A, B, and D don't satisfy the equation.

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