Question

The volume of the cubical tank is $125000{m^3}$. Find the length of its sides.

Answer 1

Hint: Volume is measured in "cubic" units. The volume of a figure is the number of cubes required to fill it completely, like blocks in a box. Volume of a cube = side times side times side. Since each side of a square is the same, it can simply be the length of one side cube.

Complete step-by-step answer:
Volume of the tank is given to us and we know that the volume of the cubical tank will be cube of a length which in this case is unknown.
Therefore, let us consider a variable whose cube is $125000{m^3}$
Therefore,
${a^3} = 125000{m^3}$
To find the value of the length we have to solve the above equation,
Therefore,
$a = {125000^{\frac{1}{3}}}$
We can write the value of $125000$ as multiples of cubes.
Therefore,
$a = {\left( {125 \times 1000} \right)^{\frac{1}{3}}}$
$a = {\left( {{5^3} \times {{10}^3}} \right)^{\frac{1}{3}}}$
If we open the brackets, using the formula ${\left( {{a^m} \times {b^m}} \right)^{\frac{1}{m}}} = \left( {a \times b} \right)$
Therefore, on using the above formula, it becomes,
$a = 5 \times 10$
$a = 50$

Note: Make sure that you write the units.
Therefore, the lengths of the sides of the cubical tank are 50m each.