1) The length, breadth & height of a Rectangular iron block is 8cm , 4 cm & 2cm. This is melted and recasted to a cubical square block of same length, breadth & height. Now what is its length.?
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Area of four walls of a room= 2( length+ breadth) ×height sq.units
= 2(8+4)×2= 24×2= 48 sq units
here 48- 6= 42
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