. How many envelopes can be made out of a sheet of paper 324 cm by 172 cm, if each envelope requires a piece of paper of size 18 cm by 12 cm?
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Length of the sheet of paper=324cm
Breadth of sheet of paper=172cm
Area of sheet paper=length x breadth=324 x 172 cm²
Area of the piece of paper required for on envelope=18 x 12 cm²
Number of envelopes=324×172/18×12
=258
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