prashantrchawla wrote:

This is how I went with this question,

180x+210y=198z. x+y=z

By putting this value in the first equation.

x/y = 2/3. Answer is C. This is what the question has asked to calculate.

Hi Prashant,

The Second statement says that

The mixture is sold at 198/kg It does not tell how much it costs after mixing two varieties of coffee.

The dealer might be earning some profit that's why cost price might differ from selling price. So, we can't form this equation 180x+210y=198z by combining both statements.

Detailed SolutionLet's say the ratio of two varieties is x:y

Statement 1: 180x+210y-- it does not tell anything further. So, this statement is not sufficient

Statement: It does not talk about the cost price. Just by knowing the selling price, we can't determine the ratio of two varieties of coffee.

Combining both statements:

Since the second statement does not tell any information relevant to first statement i.e.

by knowing the cost price of two different varieties which dealer mixes and by knowing the selling price of the mixture, the ratio of two varieties can not be determined.

The correct answer is E.

Hope it helps.

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