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    Question

    A mixture contains salt and water

    in the ratio of 2:5 respectively. If the ratio of the cost of salt and that of the mixture of salt and water is 9:4, then find the ratio of the cost of salt to that of water.
    A 9:2 Correct Answer Incorrect Answer
    B 8:9 Correct Answer Incorrect Answer
    C 1:2 Correct Answer Incorrect Answer
    D 3:1 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let the cost of salt, cost of mixture, and cost of water be 9x, 4x, and y respectively. CP of Salt              CP of Water 9x                                y               4x (4x − y)                        5x (4x − y)/5x = 2/5 20x − 5y = 10x 10x = 5y = x/y = 1/2 Ratio of cost of salt to that of water = 9x:y = 9(1):2 = 9:2

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