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Area of sheet of paper = 3.24× 1.72 = 5.57 m^2
Each envelope requires = 18× 12 /10000 = 0.0216
no of envelopes required = 5.57/0.0216= 258
Each envelope requires = 18× 12 /10000 = 0.0216
no of envelopes required = 5.57/0.0216= 258
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