Railways Mathematics Ratio Proportion and Partnership Sample Paper Ratio, Proportion & Partnership Sample Test Paper-6

  • question_answer In 30 litres mixture of milk and water, the ratio of milk and water is 7 : 3. Find the quantity of water to be added in the mixture in order to make this ratio 3: 7.

    A)  30 litres

    B)  40 litres 

    C)  20 litres

    D)  10 litres

    Correct Answer: B

    Solution :

    [b] In 30L mixture ratio of milk and water = 7 : 3 \[\therefore \,\] Milk = 21L, Water = 9L Let added water = xL \[\therefore \] \[\frac{21}{9+x}=\frac{3}{7}\] 27 + 3x = 147 3x = 120 x = 40 \[\therefore \,\] 40L water added

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