Find the next number in the sequence:
11, 19, 14, 22, 17, 25, ?
20, 28 (two series – every second number: 11, 14, 17, 20 and 19, 22, 25, 28)
20, 28 (two series – every second number: 11, 14, 17, 20 and 19, 22, 25, 28)