A cubical tank with edge $2m$ is filled with water. How many buckets of capacity $10$ litre can be filled from the tank? ($1m^3=1000l$).

The correct option is A: $800$

We know, the volume of a cube $v=a^3$, where $a$ is the edge of the cube.

Given, Edge of the tank, $a=2m$.

Then, volume of the tank, $v=2^3=8m^3$

Since, $1m^3=1000l$

volume of the tank in litres $=8\times 1000l=8000l$.

Also, the capacity/volume of the bucket $=10l$.

Then,

Number of buckets that can be filled $=\frac{\text{Volume of tank}}{\text{Volume of a bucket}}$

$=\frac{8000}{10}=800$ buckets.

Therefore, option $A$ is correct.