Strategies and Hints
The diagrams below show the answers. In the first example, one square must be constructed inside another square. In the second example, we must first determine how to divide a space into 11 areas using 4 lines. Then by evaluating the algebraic equations, we find that the only negative expression is (20 - 11x). Therefore, one vertical line must be drawn between the digits of 27 and of 49. The next three lines must separate 14 and (16 - x) into two areas. The last line can be determined by trial and error.