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6 सेमी. आन्तरिक तथा 10 सेमी. बाहरी व्यास वाली खोखली गेंद को पिघलाकर 8 सेमी. व्यास वाले शंकु में परिवर्तित‌ किया गया। शंकु की ऊंचाई ज्ञात करो?
A. 22.5 cm
B. 23.5 cm
C. 24.5 cm
D. 25.5 cm

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Correct Answer - C
image
खोखले गोले के पदार्थ का आयतन
`=` शंकु का आयतन
`4/3pi(5^(3)-3^(3))=1/3pi(4)^(2)xxh`
`98=4h`
`h=98/4=24.5cm`

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