8, 19, 21, 25, 20, ??

Keep practicing — related questions

• 3,8,15,24,?
• ?, 19, 23, 29, 31
• 2,7,8,13,14,19,20,_
• 3 9 12 15 ......
• 1, 8, 5, 12, 9, 16, 13, 20, x
• 27 | 8 = ?
• 20,19,17,__,10,5
• 4, 8, 12, 20, ?