Question

How many envelopes of size 25cm×15cm can be made from a rectangular sheet of size 4m×1.2m?

Answer 1

area of one envelopes = 25*15=375cm^2
ar(rectangular sheet)=4*1.2=4.8
hence no. of envelopes = 375/4.8=1,800
hence 1,800 envelopes can be made

Answer 2

Answer:

128

Step-by-step explanation:

Envelope size = 25cm×15cm

Area of envelope =  25cm×15cm = 375 sq.cm.

1 sq.cm = 0.0001 sq.m.

So, 375 sq.cm = 0.0001*375 =0.0375 sq.m.

Size of rectangular sheet from which the envelopes are made = 4m×1.2m

Area of rectangular sheet = 4m×1.2m= 4.8 sq.m.

So, no. of envelopes made from rectangular sheet :

= $\frac{\text{Area of rectangular sheet}}{\text{Area of envelope}}$

= $\frac{4.8}{0.0375}$

= $128$

Hence 128 envelopes can be made from rectangular sheet .