Triangle = circle + 2, square = 2 triangles, circle = square - 30, how many triangles, circles and squares are there
Square = 2 triangles = 2 circles + 4 = 2 (square-30) + 4
Square = 2 × 30-4 = 56
Circle = 56-30 = 26
Triangle = 26 + 2 = 28
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