Coffee A and coffee B are mixed in the ratio xy by weight. A costs $50/kg and B costs $40/kg. If the cost of A is increased by 10% while that of B is decreased by 15%, the cost of the mixture per kg remains unchanged. Find x : A. 2 : 3 B. 5 : 6 C. 6 : 5 D. 3 : 2 E. 55 : 34

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According to the given data we can derive the following equations.

Cost of coffee mixture `= 50x+40y ----(1)`

It is given that the cost of A is increased by...

(The entire section contains 84 words.)

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