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 2 : 3, then the price per kg of the mixed variety is:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Rs. 18
The price of the mixture is the weighted average of the two prices, with the weights 2 and 3:
\( \displaystyle \text{Price per kg}=\frac{2\times 15+3\times 20}{2+3} \)
\( \displaystyle =\frac{90}{5}=18 \)
So the mixture costs Rs. 18 per kg.