| ( | 10 | − | 450 | l | ) | ÷ | ( | ( | 1 10 | − | l | ) | × | 1 10 | ) | = | 500 |
| Multiply both sides of the equation by: | ( | ( | 1 10 | − | l | ) | × | 1 10 | ) |
| ( | 10 | − | 450 | l | ) | = | 500 | ( | ( | 1 10 | − | l | ) | × | 1 10 | ) |
| 10 | − | 450 | l | = | 500 | ( | ( | 1 10 | − | l | ) | × | 1 10 | ) |
| 10 | − | 450 | l | = | 500 | ( | 1 10 | − | l | ) | × | 1 10 |
| 10 | − | 450 | l | = | 50 | ( | 1 10 | − | l | ) |
| 10 | − | 450 | l | = | 50 | × | 1 10 | − | 50 | l |
| 10 | − | 450 | l | = | 5 | − | 50 | l |
| - | 450 | l | + | 50 | l | = | 5 | − | 10 |
| - | 400 | l | = | 5 | − | 10 |
| - | 400 | l | = | - | 5 |
| 5 | = | 400 | l |
| 400 | l | = | 5 |
| l | = | 5 | ÷ | 400 |
| = | 5 | × | 1 400 |
| = | 1 | × | 1 80 |
| l | = | 1 80 |
| l | = | 0.0125 |