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Mixture and Alligation #10

10. In what ratio should rice at Rs.9.30 per kg be mixed with rice at Rs. 10.80 per kg so that the mixture be worth Rs.10 per kg ?
A. 6 : 7B. 7 ; 6
C. 7 : 8D. 8 : 7

Answer: Option D

Explanation:

By rule of alligation,

Cost of 1 kg rice of 1st kindCost of 1 kg rice of 2nd kind
9.310.80
Mean Price
10
10.8-10 = .810 - 9.3 = .7

Required ratio = .8 : .7 = 8 : 7.

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