Multiple choice

In what proportion should a milkman mix milk Rs. 2.40 per litre and Rs. 3.60 per litre to make a mixture worth Rs. 2.50 per litre?

  1. 5 : 17

  2. 1 : 11

  3. 11 : 1

  4. 2 : 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using allegation: (c-mean):(mean-d) where c=3.60, d=2.40, mean=2.50. Ratio = (3.60-2.50):(2.50-2.40) = 1.10:0.10 = 11:1. Verification: (11×2.40 + 1×3.60)/(11+1) = (26.40+3.60)/12 = 30/12 = 2.50.

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