Answer:
115cm^3
Explanation:
Drawing the picture really helps with this problem, all you have to do is the draw the picture and then match up the values to the appropriate formula. In this case the shape given is a 3d trapezoid (Pretty sure it has a proper name but I don't know it). This becomes really clear after trying to draw it, the drawing and the formula (as well as the matched up values) are in the attatchment below.