Sally and Ben went outside the school to draw some very large shapes on the tarmac. All the shapes they drew were discrete - they did not share any sides with any other shape. The children each had a box of 10 sticks of chalk. Each stick drew 10 metres before it was quite worn away. They both drew shapes with all sides one metre long.

Sally drew squares and octagons, 16 shapes altogether, and used up all her chalk.

How many of each shape did she draw?

Ben drew triangles, hexagons and squares. He drew 20 shapes and still had 2 sticks of chalk left. How many of each shape did he draw?