The surface area and volume of a cube with an edge length of $x \ cm$ are numerically equal. Find the value of $x$.

The ratio of the radii of a sphere and a hemisphere is $3:2$. Find the ratio of the surface area of the sphere to the total surface area of the hemisphere.

For a given cylinder,the radius of the base is $28 \, cm$ and its height is $90 \, cm$. Find the curved surface area and the total surface area of the cylinder.

The edges of three of the four cubes are $1\, cm, 9\, cm$ and $10\, cm$ respectively. If the total volume of two cubes with $9\, cm$ edge and $10\, cm$ edge is equal to the volume of the remaining two cubes,find the edge of the fourth cube in $cm$.

There are two boxes of metal sheet. The length,width,and height of a cuboidal box are $30 \, cm$,$25 \, cm$,and $20 \, cm$ respectively. $A$ cubical box has each edge of $25 \, cm$. Find out which box requires more metal sheet and by how many $cm^2$?

$1 \text{ litre} = \ldots \ldots \ldots \text{ cm}^3$