| ( | n | − | 250 | ) | ÷ | 11 5 | = | 9 20 | n | − | 100 |
| Left side of the equation = | n | × | 5 11 | − | 250 | × | 5 11 |
| = | n | × | 5 11 | − | 1250 11 |
5 11 | n | − | 1250 11 | = | 9 20 | n | − | 100 |
5 11 | n | − | 9 20 | n | = | - | 100 | + | 1250 11 |
1 220 | n | = | - | 100 | + | 1250 11 |
1 220 | n | = | 150 11 |
| n | = | 150 11 | ÷ | 1 220 |
| = | 150 11 | × | 220 |
| = | 150 | × | 20 |
| n | = | 3000 |