The Number
11 in the second circle must be replaced to
16 to make a series.
From the first circle numbers are divides by 2 and moves to next part in a anti clockwise sense .
30/2=1536/2=1832/2=16
From the Second circle numbers are multiplied by 4 and moves to next part in a anti clockwise sense .
15×4=6018×4=7211×4=44