1. In a 90 litres mixture of milk and water, percentage of water is only 30%. The milkman gave 18 litres of this mixture to a customer and then added 18 litres of water to the remaining mixture. What is the percentage of milk in the final mixture ?






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  • By: anil on 05 May 2019 01.30 am
    In 90 liters of mixture,
    Amount of water=$$frac{90 imes30}{100}$$.
    =27 liters.
    Amount of milk=$$frac{90 imes70}{100}$$.
    =63 liters.
    Similarly, in 18 liters of mixture,
    Amount of water=$$frac{18 imes30}{100}$$.
    =5.4 liters.
    Amount of milk=$$frac{18 imes70}{100}$$.
    =12.6 liters.
    After removing 18 liters of solution,
    Amount of water=27-5.4=21.6 liters.
    Amount of milk=63-12.6=50.4 liters.
    After adding 18 liters of water,
    Amount of water in the solution=21.6+18=39.6 liters.
    Hence, Percentage of milk in solution=$$frac{50.4}{50.4+39.6} imes 100$$.
    =56%.
    Hence, Option E is correct.
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