Question

A roll of paper $35cm$ by $22cm$ was cut and $25$ cubes with edge $2cm$ were made from it. Find the area of the paper left.

• A. $120c{m}^2$
• B. $170c{m}^2$
• C. $180c{m}^2$
• D. $200c{m}^2$

Answer 1

Answer: (B)

$170c{m}^2$

Area of roll of paper $=35\times 22=770{cm}^2$

TSA of each cube $=2^2\times 6=24{cm}^2$

Paper needed to make 25 cubes $=24\times 25=600{cm}^2$

Area of paper left $=770-600=170{cm}^2$