Deepak Bora
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A solid metallic sphere of diameter 21 cm is melted and recast into a number of smaller cones, each of diameter 3.5 cm and height 3 cm. Find the number of cones so formed

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In the given problem shape of the object is sphere to find answer of this question need to use sphere volume formula. This question was asked in 2004 cbse board exam. Question from RS Aggarwal book chapter volume and surface area of solid, page number 810, exercise 17B, problem number 9

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