Assuming this, you have to start by writing two equations from the information provided:
180 total tickets were sold
x+y=180
they made $590 and adult tickets cost $4 and kids tickets cost $2
180=4x+2y
lets solve for x in the first equation:
x=180-y
we can plug this into the second equation and solve for y
590=4(180-y)+2y
590=720-4y+2y
590=720-2y
-130=-2y
y=65
we can plug this into the first equation and solve for x:
x+65=180
x=115
I hope this helps.