Answer:
2 staff members
Explanation:
Given
See attachment for missing details
Let
![s \to staff\ member](https://img.qammunity.org/2022/formulas/mathematics/college/vd5kdyionf1g1ls8ni77ae4cjh9wwg6ppb.png)
![p \to participant](https://img.qammunity.org/2022/formulas/mathematics/college/lffunfru4dy5rstihvltmlq7orw5cr4xzj.png)
![e \to puzzle](https://img.qammunity.org/2022/formulas/mathematics/college/sdbvx5wlovs1bb2b7qn9waegljvkz03ceg.png)
Required
Staff members for 18 participants
From the attachment, we have:
---- 1 staff member to 8 participants
![s \to 8p](https://img.qammunity.org/2022/formulas/mathematics/college/d4v7x2d0g1520imruykonfj8707rvtjqgi.png)
Multiply both sides by 1
![s * 2 \to 8p * 2](https://img.qammunity.org/2022/formulas/mathematics/college/ngs47y8g47wpw7vkxrnly3m9gelxr68egw.png)
![2s \to 16p](https://img.qammunity.org/2022/formulas/mathematics/college/9tdnmq6t12dzcoisix9vqiyp60ntyi6caa.png)
This means that 2 staff members are required for 16 participants