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Q.
The cost of Type 1 rice is Rs. 15 per kg and Type 2 rice is Rs.20 per kg. If both Type 1 and Type 2 are mixed in the ratio of 2 : 3, then the price per kg of the mixed variety of rice is
A.
Rs. 19.50
B.
Rs. 19
C.
Rs. 18
D.
Rs. 18.50
View Answer
Correct choice: C
Explanation:
Let the price of the mixed variety be Rs. x per kg. By the rule of alligation, we have : Cost of 1 kg of type 1 rice Cost of 1 kg of type 2 rice ∴(20-x)/(x-15) = 2/3 ⇒ 60 - 3x = 2x - 30 ⇒x = 18.
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