Postal or Sorting Assistants Model Paper 13 for online practice

From a right circular cylinder of radius 10 cm and height 21 cm, a right circular cone of same base-radius is removed. If the volume of the remaining portion is 4400 $\mathit{c}{\mathit{m}}^3$ , then the height of the removed cone 22 (Taking π = $\frac{22}{7}$ ) is 7