The answer is 7.

Let a square be X, a circle be Y and a triangle be Z. 。

Because the number 3 in figure 1 is smaller than that in figure 2, figure 1 is a square+circle, and figure 2 is a circle-square.

(By default, if two drawings are tangent, they are subtracted, and if they are not tangent, they are added. )

That is, x+y = 3 and y-x = 1. So the square (X)= 1 and the circle (Y)=2.

As shown in Figures 3 and 4, if Z+ 1=6, then Z=5. Bring it to Figure 4,5-1= 4! ! !

Then, it can be seen that Figure 5 is not tangent, but should be circle+triangle =5+2=7.

This kind of question is too roundabout, or it may be wrong. Please forgive me.