Numbers Puzzles

21. What comes next?
 
Answer
5
The numbers are the alphabetical positions of the letters, spelling FACADE :
6-F; 1-A; 3-C; 1-A; 4-D; 5-E.
22. What number goes into the empty brackets?
 
Answer
5 6 2 5
The first number inside the brackets is the square root of the number outside the brackets. The remaining number inside the brackets is the square of the number outside the brackets.