Three cubes of iron whose edges are 6cm, 8cm and 10cm respectively are melted and formed into a single cube. The edge of the new cube formed is	Answers:	A) 10 cm	B) 12 cm	C) 16 cm	D) 18 cm	E) None
Sol.   Volume of the new cube   = (63 + 83 + 103) cm3   = 1728cm3.   Let the edge of the new cube be a cm.   ∴ a3 = 1728   ⇒ a = 12.   Answer 12 cm
<result>B</result>
Three cubes of iron whose edges are 6cm, 8cm and 10cm respectively are melted and formed into a single cube. The edge of the new cube formed is