Draw a bar model: each chair = 1 unit, each stool = 1 unit - $10.
4 chairs + 3 stools = 4u + 3(u - $10) = 7u - $30 = $173.
7u = $203, 1 unit = $29. Stool = $29 - $10 = $19.AGS Rule Box
| Cost relation | = | Stool = Chair - $10 |
| 4 chairs + 3 stools | = | 4u + 3(u - 10) = 7u - 30 = $173 |
| 7 units | = | $173 + $30 = $203 |
| 1 unit (chair) | = | $203 / 7 = $29 |
| 1 stool | = | $29 - $10 = $19 |
Final Answer: 19