The problem figure is a square split by a vertical line into a narrow left part (about 40 percent of the width) and a wide right part (about 60 percent). The narrow left part is cut by a horizontal line about 37 percent down and has a slanting line in each of its two cells. The wide right part is cut by a horizontal line about 66 percent down and has two slanting lines from a point on the dividing line to its right edge, plus one slanting line in its lower cell. In the mirror image the wide part is on the left and the narrow part on the right. The horizontal line at 66 percent is now in the left part and the one at 37 percent in the right part, and every slanting line leans the opposite way. So the wide left part has two lines from the point on the dividing line to the left edge (to the top-left corner and to the end of the horizontal line) and a down-right slant in its bottom cell. The narrow right part has a down-right slant in its top cell and a line from the right edge to the bottom of the dividing line. Option 3 is the only figure with all these features. Option 1 joins the dividing-line point to the bottom-right corner, option 2 has the bottom slant of the wide part leaning the wrong way, and option 4 has the top-right slant leaning the wrong way. Answer: (3) the third figure
