Multiple choice

if the radius of cylinder is doubled, and height is reduced by 20 % then find the % change in volume? यदि बेलन की त्रिज्या दोगुनी कर दी जाए और ऊंचाई 20% कम कर दी जाए तो आयतन में % परिवर्तन ज्ञात कीजिए?

  1. 300 %

  2. 200 %

  3. 220%

  4. 250%

  5. 100%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Original volume V = πr²h. New volume V' = π(2r)²(0.8h) = π(4r²)(0.8h) = 3.2πr²h = 3.2V. Percentage change = (3.2V - V)/V × 100 = 220%.

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