algebra

$\textbf{Fill in the blank: 3*___ = 81*5}$

Let us fill in the blank with a variable, namely $x$.

$3\times{x}=81\times5$

Simplify to:

$3x=405$

$\boxed{\textbf{x=135.}}$

Wondeful thinking BlackjackEd!

However, there is an alternative method:

3X=81 x 5

We could first divide both sides by 3 and get

X=27 x 5

This also gives us 135.