The Junior High band sold candy for the fundraiser. The profit from the candy sale was $180. The girls sold three times as much candy as the boys. How much of the total profit did the boys provide?

Let X the price of candy the girls sold

and Y for the boys

so we have X + Y = 180

and X = 3Y

so X + Y = 180

X - 3Y = 0

is a system of equation for solving

it is 4Y=180 implies Y = 45, and X = 3Y = 3.45 = 135

so the boys did provide $45