Question 8420
Ticket sales for a play total $2200 there are 3 times as many adult tickets sold as childrens tickets. The prices of the tickets for adults and children are $6 and $4 respectively. Find the number of childrens tickets sold.

Let x be the number of children tickets. So 3x is the number of adult tickets.

So you have:
3x + x = 2200
4x = 2200
You divide 4 to both sides:
4x/4 = 2200/4
x = 550
Check:
You replace the x with 550:
3(550) + 550 = 2200

1650 + 550 = 2200