Question 283361
Let x = total number of students<br>
{{{(2/3) * x + 12 = x }}}
{{{ 12 = x - ((2/3) * x)}}}
{{{ 12 = (1/3) * x }}}<br>
multiply both side by 3
{{{ 12 * 3 = (1/3) * x * 3}}}
36 = x and bob's your uncle!