First thing you have to do is cute the shape in "half".
V= l x w x h
(length x width x height)
So the top of the shape...
l = 20cm
w= 15cm
h = 10cm
Now all you have to do is plug everything in for the top -
v = 20 x 15 x 10
v = 3000
Due to the bottom part having the same measurements, all you have to do is the volume of both to get you the total volume of the whole shape.
3000 x 2 = 6000 cm3
Answer - 6,000 cm 3