Explanation:

- Let's set variables for the prices of rice types. Type 1 costs Rs 126 per kg, Type 2 costs Rs 135 per kg, and Type 3 costs Rs X per kg.

- They are mixed in a ratio of 1:1:2. So, in terms of parts: 1 part of Rs 126/kg, 1 part of Rs 135/kg, and 2 parts of Rs X/kg.

- From the ratio, for the total mixture:

(126*1 + 135*1 + 2X*1) / 4 = 153.

- Solving it:

126 + 135 + 2X = 612

261 + 2X = 612

2X = 351

X = 175.5

- So, the price of the third variety is Rs 175.5 per kg.

Option 4 is correct

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