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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

Rs. 19.50
Rs. 19
Rs. 18
Rs. 18.50

Correct Answer: Rs. 18

Explanation:

Given:

Cost of Type 1 rice = Rs. 15/kg
Cost of Type 2 rice = Rs. 20/kg
Mixing ratio = 2 : 3 (Type 1 : Type 2)

Step 1: Use the weighted average formula

Price per kg = (15 × 2 + 20 × 3) / (2 + 3)

Step 2: Calculate

= (30 + 60) / 5 = 90 / 5 = Rs. 18

Answer: Rs. 18

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