27
There are two interwoven series.
A) 2,5,10,17 2 + 3 = 5 : 5 + 5 = 10 : 10 + 7 = 17
Each term takes the previous term and adds increasing odd numbers starting with 3.
B) 9,13,19....and then 27 9 + 4 = 13 : 13 + 6 = 19 : 19 + 8 = 27
Each term takes the previous term and adds increasing even numbers starting with 4.
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27.
The next figure would be 21, followed by 11 & 10.
22
37.
It's, 7n+6