Question 10
Line $AB$ divides the figure made of unit squares into two equal areas. If $x=m/n$, where $m,n$ are relatively prime positive integers, find $m+n$.
The source sketch is not to scale. Interpret x as the vertical height where AB meets the right edge; the equal-area condition determines the line. Do not assume additional grid-vertex incidences from the sketch.
The source sketch is not to scale. Interpret x as the vertical height where AB meets the right edge; the equal-area condition determines the line. Do not assume additional grid-vertex incidences from the sketch.