Question 201038
Let {{{x}}} = the number of toys Ben will have to make
given:
Ben's cost for the toys is {{{1.8x}}}
Ben's income from selling the toys is {{{3x}}}
If {{{P}}} is the profit, 
{{{P = 36}}}
---------------
In words:
profit = total sales income - total cost
{{{P = 3x - 1.8x}}}
{{{36 = 3x - 1.8x}}}
{{{36 = 1.2x}}}
{{{x = 30}}} answer