Find the ratio in which rice at Rs. 8.30 per kg be mixed with rice at Rs. 5.30 per kg to produce a mixture worth Rs. 6.30 per kg.

Correct option is B

Given:
Cost of first type of rice = Rs. 8.30 per kg
Cost of second type of rice = Rs. 5.30 per kg
Cost of mixture = Rs. 6.30 per kg
Formula Used:
The formula for the mixture problem is:
Ratio = (C₂ - C_m) / (C_m - C₁)
Where:
C₁ = Cost of first type of rice
C₂ = Cost of second type of rice
C_m = Cost of mixture
Solution:
​$$\text{Ratio} = \frac{5.30 - 6.30}{6.30 - 8.30} = \frac{-1}{-2} = \frac{1}{2}$$ 
Alternate Solution: