Cardboard is very good recycling material. Collected cardboard is flattened first and the tied in in bundles that are 15 cm thick. 3.2.1. Convert 15 cm to mm. 3.2.2. A box is approximately 8mm thick when it is flattened. Use the answer in question 3.2.1 to determine the number of boxes that can be tied together to form a bundle. 3.2.3. The bundles are stacked and tied into blocks that are 1,2 metres high. How many bundles are used to make one block of cardboard?​