| 240 | = | 240 | ( | 1 10 | + | 3 5 | + | 3 50 | ) | ( | 1 | + | a | ) |
| Right side of the equation = | 240 | × | 1 10 | ( | 1 | + | a | ) | + | 240 | × | 3 5 | ( | 1 | + | a | ) | + | 240 | × | 3 50 | ( | 1 | + | a | ) |
| = | 24 | ( | 1 | + | a | ) | + | 144 | ( | 1 | + | a | ) | + | 72 5 | ( | 1 | + | a | ) |
| = | 24 | × | 1 | + | 24 | a | + | 144 | ( | 1 | + | a | ) | + | 72 5 | ( | 1 | + | a | ) |
| = | 24 | + | 24 | a | + | 144 | ( | 1 | + | a | ) | + | 72 5 | ( | 1 | + | a | ) |
| = | 24 | + | 24 | a | + | 144 | × | 1 | + | 144 | a | + | 72 5 | ( | 1 | + | a | ) |
| = | 24 | + | 24 | a | + | 144 | + | 144 | a | + | 72 5 | ( | 1 | + | a | ) |
| = | 168 | + | 168 | a | + | 72 5 | ( | 1 | + | a | ) |
| = | 168 | + | 168 | a | + | 72 5 | × | 1 | + | 72 5 | a |
| = | 168 | + | 168 | a | + | 72 5 | + | 72 5 | a |
| = | 912 5 | + | 912 5 | a |
| 240 | = | 912 5 | + | 912 5 | a |
| - | 912 5 | a | = | 912 5 | − | 240 |
| - | 912 5 | a | = | - | 288 5 |
288 5 | = | 912 5 | a |
912 5 | a | = | 288 5 |
| a | = | 288 5 | ÷ | 912 5 |
| = | 288 5 | × | 5 912 |
| = | 6 | × | 1 19 |
| a | = | 6 19 |
| a | = | 0.315789 |