How many envelopes can be made out of a sheet of paper 3m24cm by 1m72cm if each envelopes requires a piece of paper of size 18cm by 12cm
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area of paper - 324 × 172 cm sq
area of 1 envelope - 18 × 12 cm sq
no. of enevelopes = area of paper/area of 1 envelope
=324×172/18×12
=258
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