Multiple Choice Questions on If radius of cone decrease by 50 and height increase by 20 Then find the percentage change in the vo........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

If radius of cone decrease by 50 and height increase by 20 Then find the percentage change in the vo...........

Quantitative Aptitude ( CCS) Mensuration 3D
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    If radius of cone decrease by 50% and height increase by 20%. Then find the percentage change in the volume.

    70% decrease

    Correct Answer

    70% increase

    Incorrect Answer

    40% decrease

    Incorrect Answer

    40% increase

    Incorrect Answer
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    Explanation:

    Volume of cone= 1/3 π*r2 * h
    r=50% dec =1/2 =>2————1
    2———–1(dec)
    h=20% inc =1/5 =>5————-6 (inc)
    2*2*5:1*1*6=10:3
    (3-10)/10*100=70% dec

    By: Amit Kumar
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