Aliyah is solving a question, where a given number has to be multiplied by 22. Aliyah did not read the question carefully, and multiplied the number by 2 (instead of 22). If her answer is 400 less than the correct answer, find the given number.
A solid cylinder of radius 3 cm and height 7 cm is melted and re-shaped as a cuboid. If the length and breadth of the cuboid are 9 cm and 2 cm respectively, find the height of the cuboid. (Assume π = 22/7)