Tables and chairs

This task is about spatial patterns and rules.
A room has tables that are shaped like this. Each table can seat 5 people.
 

one table with 5 chairs

Here is a picture of 3 tables in a row.

3 tables with 11 chairs

Question 1Change answer

a)  Six tables are put together in one long row (as above).
How many people could be seated?  people

Question 1Change answer

b)  35 people needed to be seated in one long line of tables (arranged as above).
How many tables would be needed?  tables

Question 2Change answer

c)  Write a rule to work out the number of people that could be seated in a long row of any number of tables.
Rule: