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Mixture and Alligation #20

20. In what ratio must rice at Rs.7.10 be mixed with rice at Rs.9.20 so that the mixture may be worth Rs.8 per kg?
A. 5 : 4B. 2 : 1
C. 3 : 2D. 4 : 3

Answer: Option D

Explanation:

By rule of alligation,

CP of 1 kg rice of 1st kindCP of 1 kg rice of 2nd kind
7.19.2
Mean Price
8
9.2 - 8 = 1.28 - 7.1 = .9

Required ratio = 1.2 : .9 = 12 : 9 = 4 : 3

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