Discussion
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:
Answer: A
Take the quantities as 2 kg and 3 kg, five kilograms in all.
\[ \frac{2(15) + 3(20)}{5} = \frac{30 + 60}{5} = \text{Rs. } 18 \]
The result is the weighted average, closer to 20 than to 15 because more of the dearer rice is used.
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