a lead pencil consists of a cylindrical wood with a solid cylinder of graphite filled in the interior the diameter of the pencil is 7.7 mm and the diameter of graphite is 2 mm if the length at the pencil is 7 cm find the volume of wood and that of graphite?
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One group activity is given to the students to make the two different sizes of boxes with the dimensions are as 25 ܿ݉ × 20ܿ݉ × 5ܿ݉ and other dimensions are as 15 ܿ݉ × 12ܿ݉ × 5ܿ݉ with the cardboard. For all decoration of box, they need extra 10%cardboard of the total surface area. If the cost of cardboard is 5 rupees for 1000 ܿ݉ find the cardboard required for 100 boxes of each kind.
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