Tea worth Rs. 126 per kg and Rs. 135 per kg are mixed with a third variety in the ratio 1:1:2. If the mixture is worth Rs. 153 per kg, the price of the third variety per kg will be:
A
Rs. 169.50
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B
Rs. 170
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C
Rs. 175.50
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D
Rs. 180
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Solution
The correct option is B Rs. 175.50 Since first and second varieties are mixed in equal proportions. So, their average price = Rs. (126+1352)= Rs. 130.50 So, the mixture is formed by mixing two varieties, one at Rs. 130.50 per kg and the other at say, Rs. x per kg in the ratio 2:2, i.e., 1:1. We have to find x. By the rule of alligation, we have: ∴x−15322.50=1 ⇒x−153=22.50 ⇒x=175.50