You connect the points (0, 0) and (9, 6) with a line segment. Starting at (0, 0), you move 1/4 of the way along the segment. What is the sum of the coordinates of the point you land upon?
Here are the points 1/4 of the way:
(0, 0)
(2.25, 1.5)
(4.5, 3) [midpoint]
(6.75, 4.5)
(9, 6)
We want the sum of the coordinates of the point in bold, which is 3.75.