Acomposite figure is formed by combining a square and a triangle. it’s total area is 43.5 ft.². the area of the triangle is 18.5 ft.². what is the length of each side of the square?

The complete question in the attached figure

we know that
[volume of a rectangular prism]=L*W*H

so
[volume of a rectangular prism X]=7*3*6---------> 126 cm³

[volume of a rectangular prism Y]=5*2*11---------> 110 cm³

126 cm³ > 110 cm³
the volume of x container is > volume of y container

therefore

the answer is
The container X will hold more