Mensuration Practice Test 1

Let the number added either in the radius or in the height = x
Volume of the cylinder = $\mathit{\pi }{\mathit{r}}^2\mathit{h}$
$\mathit{\pi }{\left(10+\mathit{x}\right)}^{2.}\left(4\right)$ = $\mathit{\pi }{\left(10\right)}^2\left(4+\mathit{x}\right)$
Dividing both sides by p,
400 + $4{\mathit{x}}^2$ + 80x = 400 +100x
$4{\mathit{x}}^2$ − 20x = 0
x(4x − 20) = 0
x = 0 or x = 5 is impossible.
So, x = 5