Multiple choice

How much chicory at $Rs. 4$ a kg should be added to $15\ kg$ of tea at $Rs. 10$ a kg, so as to make the mixture worth $Rs. 6.50$ a kg?

  1. $21\ kg$
  2. $16\ kg$
  3. $4\ kg$
  4. $7\ kg$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Use allegation: (Price_tea - Price_mix) / (Price_mix - Price_chicory) = Quantity_chicory / Quantity_tea. (10 - 6.5) / (6.5 - 4) = x / 15. 3.5 / 2.5 = x / 15. 1.4 = x / 15. x = 21.

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