Practicing Success
If the radius of a sphere is increased by 20%, its volume is increased by how much percent? |
72.8% 60% 80% No Change |
72.8% |
20% = \(\frac{1}{5}\) Ratio of radius ⇒ R : r = 5 : 6 Ratio of volumes = \(\frac{4}{3}\) \(\pi \)R3 : \(\frac{4}{3}\) \(\pi \)r3 = R3 : r3 = 53 : 63 = 125 : 216 Volume increased by = 216 - 125 = 91 Increased percentage = \(\frac{91}{125}\) × 100 = 72.8% |