| w | w | ( | 1 | + | 1 5 | w | × | 1 5 | w | ) | ( | 1 | + | 1 20 | w | × | 1 20 | w | ) | = | 36 |
| Left side of the equation = | w | w | × | 1 | ( | 1 | + | 1 20 | w | × | 1 20 | w | ) | + | w | w | × | 1 5 | w | × | 1 5 | w | ( | 1 | + | 1 20 | w | × | 1 20 | w | ) |
| = | w | w | × | 1 | ( | 1 | + | 1 20 | w | × | 1 20 | w | ) | + | w | w | × | 1 25 | w | w | ( | 1 | + | 1 20 | w | × | 1 20 | w | ) |
| = | w | w | × | 1 | × | 1 | + | w | w | × | 1 | × | 1 20 | w | × | 1 20 | w | + | w |
| = | w | w | × | 1 | + | w | w | × | 1 400 | w | w | + | w | w | × | 1 25 | w |
| = | w | w | × | 1 | + | w | w | × | 1 400 | w | w | + | w | w | × | 1 25 | w |
| = | w | w | × | 1 | + | w | w | × | 1 400 | w | w | + | w | w | × | 1 25 | w |
| w | w | × | 1 | + | w | w | × | 1 400 | w | w | + | w | w | × | 1 25 | w | = | 36 |