Question

How many envelopes of size $20xm\times 30cm$ be made from a rectangular sheet of paper measuring $5m\times 3m$?

Answer 1

The area of one envelope is,

$A=20\times 30$

$=600c{m}^2$

The area of the paper is,

$A=5m\times 3m$

$=500cm\times 300cm$

$=150000c{m}^2$

Number of envelopes can be made by dividing the areas of paper by the area of one envelope.

$No.ofenvelopes=\frac{150000}{600}$

$=250$

Therefore, 250 envelopes can be made.