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Ratio between curved surface area and total surface area of a circular cylinder is 3 : 5. If curved surface area is `7392 cm^3` then what is the height of cylinder.A. 48B. 21C. 47D. 42

Answer» Correct Answer - D
According to question,
`(2pirh)/(2pir(r+h))=3/5`
`5h=3r+3h`
`2h=3r and 2pirh=7392`
`2xx22/7xx2/3hxxh=7392`
`h=42`
`:." Height of cylinder "=42 cm`


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