Question 145161
Let x= number of $5 tickets sold
then 3x = number of $2 tickets sold


Then from:"If all the tickets are sold, receipts from the $5 tickets will be $50 less than those from the $2 tickets."
We can derive our equation:

5x = 2(3x) - 50

Do you see how the equation was derived?  Does that make sense?
Can you complete it from here?