1. A rectangular white paper with Zhang Changkuan of 3 1 cm and 29 cm, respectively, was cut into a small right triangle with a base of 4 cm and a height of 3 cm. How many triangles can you cut at most?

3 1/3≈ 10

29/4≈7

10*7*2= 140 (piece)

2. The school will build 32 classrooms, with a length of10m, a width of 6m and a height of 3.5m.. Now, the four walls of the classroom will be covered with 1.2 meters high tiles, excluding the 6 square meters of doors, windows and blackboard area. How many square meters are these classrooms tiled?

(6+10) * 2 *1.2-6 = 32.4 (m2)

32.4*32= 1036.8 (m2)

3. A book, read 45 pages a day, and finish it on 16; If you read 54 pages every day, 14 days will be enough. This book has a maximum of (756) pages and a minimum of (676) pages.