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Find the ratio in which rice at Rs. 7.20 a kg be mixed with rice at Rs. 5.70 a kg to produce a mixture worth Rs. 6.30 a kg.

Correct Answer: 2:3

Explanation:

Given:

Price of first rice = Rs. 7.20/kg
Price of second rice = Rs. 5.70/kg
Mean price of mixture = Rs. 6.30/kg

Apply alligation rule:

Ratio = (High - Mean) : (Mean - Low) = (7.20 - 6.30) : (6.30 - 5.70) = 0.90 : 0.60 = 3 : 2

Answer: 3 : 2

That means rice at Rs. 5.70/kg and Rs. 7.20/kg should be mixed in the ratio 3:2.

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