Question 1068252
Well we know that volume is equal to length time width times height.

We can translate this to algebraic form as: {{{V=L*W*H}}}

From your problem, we are given the following:
Cubical tank is:
- 6m long (length)
- 3m height (height)
- 105m volume (volume)

Let's plug in what we know:
{{{105=6*W*3}}}

We were not given the width, so let's solve for it!

{{{105=6*W*3}}}
Divide both sides by 18 to get:
{{{105/18=W }}}

This simplifies to{{{15.833333333...=W }}} on a calculator

Your final answer would be:
The width of the cubical tank is about 15.83 meters wide.

By the way, the tank would not be a cubical since all four sides would have to be the same (which they are not). In other words, 105 is not a perfect cube.