Find the missing number?

Solution (By Examveda Team)

For First Circle:
Left segment element * right segment Element - 3 = Lower number
3 *7 - 3 = 18.

For Second Circle:
Left segment element * right segment Element - 4 = Lower number
8 *2 - 4 = 16.

For Third Circle:
Left segment element * right segment Element - 5 = Lower number
x = 9 *3 -5
x = 22.
Missing number = 22.