If it is possible not to come, it is 0, and bringing up to 3 people is 4.

There will be the following combinations.

(0-4)

( 1-2)

( 1- 1)

(2-3)

.

.

.

.

.

(3-3)

Do accumulation (90-230)

The average value is 160.

Each table has 10 people (minimum, more than one person can sit)

Table 16

The hotel can temporarily add tables, which can reduce two tables.

14 table, 14 Chinese unlucky, 13 table, 13 devil unlucky.

So the table 12 or 15

Then you can set the whole table to 16. After receiving the money, arrange it if there is a place, and leave it alone if there is no place.