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					 In what proportion must tea at Rs. 62 per kg be mixed with tea at Rs. 72 per kg in order to obtain the mixture worth Rs. 65 per kg?
 
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- 4: 6
 - 7: 3
 - 2: 3
 - 4: 7
 
 
Correct Option: B
Using Alligation rule, 
(Quantity of cheaper tea) / (Quantity of dearer tea)  = (d - m) / (m  - c) =  7/3
Therefore, they must be mixed in the ratio of 7 : 3.