Question 648090
Start by letting N = the unknown number, then:
{{{(1/5)N+(1/6)N = 33}}}
Simplify this:
{{{N/5+N/6 = 33}}} Add the fractions on the left. The LCD is 5X6 = 30.
{{{(6N+5N)/30 = 33}}} 
{{{11N/30 = 33}}} Multiply both sides by 30.
{{{11N = 990}}} Finally, divide both sides by 11.
{{{N = 90}}}