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In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 20 per kg respectively to get a mixture worth Rs. 16.50 per kg?

1. 3:7
2. 5:7
3. 7:3
4. 7:5

Correct answer: 7:3

Solution

By alligation, ratio of cheaper to dearer = (20 - 16.5) : (16.5 - 15) = 3.5 : 1.5 = 7 : 3. Hence the required ratio is 7:3.

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