△+△=□+□+□

□+□+□=○+○+○+○

△+□+○+○=400

Solve the problem:

There are three squares in the first and second formulas.

therefore

Let's replace the three squares in the second formula with two triangles.

afterwards

It becomes:

△+△=○+○+○+○

According to this formula, we know that a triangle is equal to two circles.

therefore

A triangle equals two circles.

A square equals a circle.

The last formula

Turn a triangle into two circles.

Turn a square into a circle.

There are five circles.

Divide 400 by 5 and you will know what a circle is.

So:

○=80

△= 160

□=80