It costs 168 yuan to buy 4 tables and 6 chairs. It is known that the price of a table is twice that of a chair. How much does a table cost?

It costs 168 yuan to buy 4 tables and 6 chairs. It is known that the price of a table is twice that of a chair. How much does a table cost?

It can be 4 + 6 / 2 = 7 tables
So each table is 168 / 7 = 24 yuan

Set tables and chairs in the following way: one table can seat four people, two tables can seat six people. Go on in this way. How many people can sit on the next ten tables? How many people can sit on the table?

a1=4；a2=6；a3=8；……
Form the arithmetic sequence with A1 = 4 and tolerance d = 2
So, A10 = a1 + 9D = 4 + 9 × 2 = 22 people
That is, 10 tables can seat 22 people