You need to find the moment about the center hinge to decide, which side it would tilt.
Let the weight of each of the green squares be $w$ and the distance between the blue pointers be $a$.

The two green squares are placed at a distance of $\dfrac{3a}2$ to the left of the hinge while one green square is placed at a distance of $3a$ to the right of the hinge.

The clockwise moment about the center hinge due to two green squares on the left is given by $2w \times \dfrac{3a}2 = 3aw$.

The counter-clockwise moment about the center hinge due to one green square on the right extreme is given by $w \times 3a = 3aw$.

Hence, the net clockwise moment about the hinge is $3aw - 3aw = 0$. Hence, the seesaw won't tilt.

The plots in the question and the solution were made using TikZ.