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SSC Sample Paper SSC CGL - Sample Paper-15

  • question_answer
    From a cask of milk, containing 40 L, 8 L are drawn out and the cask is filled up with water. If the same process is repeated a second then a third time, what will be the number of litres of milk lift in the cask

    A) 20.48   

    B) 20

    C) 19.48               

    D) 21.58

    Correct Answer: A

    Solution :

    Rule After n such operations. Milk left in vessel after nth operation. = Whole quantity of milk in vessel \[x\left( \frac{x-y}{x} \right)n\]where x = total milk y = quantity of milk withdrawn. Here, x = 40, y = 8, n = 3 \[\therefore \] Required answer \[={{\left( \frac{40-8}{40} \right)}^{3}}\times 40\]             \[={{\left( \frac{4}{5} \right)}^{3}}\times 40=\frac{64}{125}\times 40\] = 20.48 L        


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