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    Question

    190 ml of mixture contains milk and water in the ratio

    of 10:x respectively. If 30 ml of water and 40 ml of milk is added into it then ratio of milk to water in the resulting mixture will be 2:1. Find the value of ‘x’. 
    A 5 Correct Answer Incorrect Answer
    B 6 Correct Answer Incorrect Answer
    C 7.5 Correct Answer Incorrect Answer
    D 4.25 Correct Answer Incorrect Answer

    Solution

    Quantity of milk in 190 ml of mixture = 190 × 10/(10 + x) Quantity of water in 190 ml of mixture = 190 × x/(x + 10) According to question; {1900/(10 + x) + 40}/{190x/(x + 10) + 30} = 2/1 Or, 1900/(10 + x) + 40 = 380x/(x + 18) + 60 Or, (1900 – 380x)/(x + 10) = 20 Or, 1900 – 380x = 20x + 200 Or, 400x = 1700 Or, x = 4.25

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