Question

The area A of four walls of a room of length $l$, breadth $b$ and height $h$ is given by the formula $A=2(l+b)h$. If $l=4.5m,b=3m$ and $h=4m$, then $A$ is equal to

• A. $40m^2$
• B. $30m^2$
• C. $60m^2$
• D. $20m^2$

Answer 1

The correct option is C $60m^2$

$A=2(l+b)h$

$l=4.5m,b=3m,h=4m$ ...given

$A=2(4.5+3)4=2\left(7.5\right)4=60m^2$