Question 4. Katrin arranges tables of size 2 by 1 according to the number of participants in a meeting. The diagram shows the top view of the tables for a small, a medium, and a large meeting. How many tables are used for the large meeting? We know that the tables have a size of 1 by 2. We know that for a large meeting, we need a length of 7. The best way to get to 7 is we'll have one table turned 90 degrees to see the 1 side, and then 3 tables with the 2 side. This gives us 1 plus 2 plus 2 plus 2, or 7. Next, we just have to fill out the rest of this so we have a square. We'll add 4 more tables like so, 2 tables like so, and 2 more like so. Now, all we have to do is count up the total number of tables, and this will give us our solution, which is C, 12.

tables arrangement

large meeting

top view

table size

solution