My solution:
a) Delete two Vertices
b) Mark four Vertices and press F
c) Mark one Vertex (left side) and press F
d) Mark one Vertex (right side) and press F
e) Mark one Edge and pull it in one direction
=> et voila
Have you other solutions?
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Very thorough approach to problem solving 
Really curious.
My solutions: (in the beginning I certainly did not know this)
a) make box, collapse 2 edges, snap sharp edge to grid
b) make box, select upper edge and snap to grid/edge/vertex, A + Remove doubles
c) make box, del 2 verts, sel 1 pair verts + F, second pair verts + F, A (sel all) + F (fill with faces all space)
(hold ctrl to enable snapping, but shift + tab to activate snapping mode)
b - fastest way)
In general, the charm of 3d in that the problem can be solved in as many ways as possible 
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Hello jakarta
I think you use advanced methods. I don’t know who I use “snap, collapse, remove doubles …”.
I will try out your solution, when I learn these methods in this course.
Thank you for your solution.