Question 73898
Let n be the number you want to find.
{{{1/n - 1/4n = 1/12}}} Simplify the left side.
{{{(4-1)/4n = 1/12}}} Multiply both sides by 4n.
{{{3 = 4n/12}}} Multiply both sides by 12.
{{{36 = 4n}}} Finally, divide both sides by 4.
{{{9 = n}}}
The number is 9.