Triangle plus square equals 35, square plus circle equals 37, circle plus triangle equals 36, then triangle is (), square is (), circle
Add the three formulas to get
Two triangles + two squares + two circles = 35 + 37 + 36 = 108
Triangle + square + circle = 54
Triangle = (triangle + square + circle) - (square + circle) = 54-37 = 17
Square = (triangle + square + circle) - (triangle + circle) = 54-36 = 18
Circle = (triangle + square + circle) - (square + triangle) = 54-35 = 19