| Draw a bar model: Science = 1 unit, Maths = 1 unit + 6, English = 1 unit + 17. | ||
| Total = 3 units + 23 = 248. |
| Total in units | = | 1 + 1 + 1 = 3 units + 6 + 17 = 3 units + 23 = 248 |
| 3 units | = | 248 - 23 = 225 |
| 1 unit (Science) | = | 225 รท 3 = 75 |
| English = 1 unit + 17 | = | 75 + 17 = 92 |