Final answer:
To calculate the total number of chairs needed for 18 tables when the ratio of chairs to tables is 6:1, multiply 18 tables by 6, resulting in 108 chairs.
Step-by-step explanation:
The student's question involves calculating the total number of chairs needed for an event based on the given ratio. Since the ratio of chairs to tables is 6 : 1, and there are 18 tables, we have to multiply the number of tables by the number of chairs per table according to the ratio.
To find the total number of chairs needed, the calculation would be as follows:
- Identify the ratio of chairs to tables, which is 6 chairs per 1 table.
- Multiply the number of tables (18) by the number of chairs per table from the ratio (6).
- The total number of chairs required is 18 tables × 6 chairs/table = 108 chairs.
Therefore, Sofía and her grandparents need to set up 108 chairs for the 18 tables.