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Railways Quantitative Aptitude Percentage Sample Paper Percentage Sample Test Paper-8

  • question_answer
    A large watermelon weighs 20 kg with 96% of its weight being water. It is allowed to staud in the sun and some of the water evaporation so that now, only 95%, of its weight is water. Its reduced weight will be

    A)  18 kg   

    B)  17 kg

    C)  16.5 kg

    D)  16 kg

    Correct Answer: D

    Solution :

    [d] 96% of 20 kg \[=\frac{96}{100}\times 20=19.2\,\,kg\] [wt. of water] Let ?x? kg of water in evaporated, then \[19.2-x=95%\,\,of\,\,(20-x)\] \[\Rightarrow \] \[19.2-x=\frac{95\times (20-x)}{100}\] \[\Rightarrow \] \[1920-100x=1900-95x\] \[\Rightarrow \] \[5x=20\] \[\Rightarrow \] \[x=4\,kg\] \[\therefore \] Reduced wt =20 ? 4 = 16 kg


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