In what ratio must coffee powder costing Rs. 300 per kg be mixed with coffee powder costing Rs. 420 per kg to get a blend worth Rs. 340 per kg?
Correct answer B. 2:1
Explanation
By the rule of alligation, cheaper : dearer = (420 - 340) : (340 - 300) = 80 : 40 = 2 : 1.
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