Question

The area of 4 walls of a hall is $30m^2$. The length and breadth of the hall are 12.5 m and 7.5 m respectively. Find the height of the wall?

• A. $x=7m$
• B. $x=12m$
• C. $x=8m$
• D. $x=18m$

Answer 1

The correct option is C $x=8m$




Let the height of the wall be x.

$=2(lh+bh)$

$=2(12.5x+7.5x)$

$=2\left(20.0x\right)$

$=2\left(20x\right)$

$=40xsquareunits$.

Given
$40x=320m^2$

$\therefore x=\frac{320}{40}$

$x=8m$