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In what ratio should two varieties of sugar of Rs.18 per kg and Rs.24 kg be mixed together to get a mixture whose cost is Rs.20 per kg?

Correct answer: D. 2:1Computer Online Quiz

  • A. 1:3
  • B. 3:1
  • C. 1:2
  • D. 2:1Computer Online Quiz

Explanation

Using alligation, the ratio of Rs.18 per kg sugar to Rs.24 per kg sugar is (Rs.24 - Rs.20) : (Rs.20 - Rs.18) = Rs.4 : Rs.2 = 2:1. This gives an average cost of (2 kg x Rs.18 per kg + 1 kg x Rs.24 per kg) / 3 kg = Rs.20 per kg. The likely mistake is option c, 1:2, which reverses the ratio and makes the mixture too expensive.

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