Question

Three times a number is the difference between four and that number

Answer 1

Convert it to an equation.

"Three times a number"
$\sf 3n$

"is"
=

"the difference between four and that number"
$\sf 4-n$

Put it all together:

$\sf 3n=4-n$

Solve for 'n', add 'n' to both sides:

$\sf 4n=4$

Divide 4 to both sides:

$\boxed{\sf n=1}$