Circle box = 120 triangle box = 78 triangle circle = 50, what is the number in the circle, what is the number in the triangle, what is the number in the box

Let the circle, the square and the triangle be x, y and Z respectively, then we can get x + y = 180, Z + y = 78, Z + x = 50 according to the problem, and the joint solution is x = 46, y = 74, x = 4, that is, the circle is 46, the triangle is 4, and the square is 74

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