Let us say we have 1kg of the mixture.

Assume in the mixture we have xkg of brand A. Then from brand B we have ((1-x)kg of rice.

According to the data given;

Cost of brand A in mixture `= x(8) = 8x`

Cost of brand B in mixture` = (1-x)(4) = 4(1-x)`

Total cost of 1kg of mixture `= 8x+4(1-x) = 4(1+x)`

But it is given that the cost of mixture is $5 per kg.

`4(1+x) = 5`

`4x = 1`

`x = 0.25`

`1-x = 0.75`

*So the ration of brand A to brand B is 0.25:0.75 = 1:3.*

*Correct answer is at option C.*

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