Find the missing number: 11, 22, 34,?

The answer is 47

Step-by-step explanation:

11, 22, 34

The difference in the sequence above is

11, 12

Therefore the next difference will be 13

Hence 34 + 13 = 47

The next number in the sequence is 47

47

Step-by-step explanation:

11+11 = 22

22+12 = 34

34+13 = 47