Solution

25048

First name
Kostas Kvietinskas
School
Westfield Middle School
Country
Age
12

if Circle = 4 Triangle in 3rd row = 6 because 4x3 = 12, the triangle must be 6 to make a total of 18
If the Triangles in 1st row total 12, both the Squares total 16 to make 28
16/2 = 8 so Square = 8
If both Squares total 16 in the 2nd row that means both the Hexagons have to total 14 to make 30
14/2 = 7 so Hexagon = 7
So Triangle + Hexagon + Circle + Circle = 6+7+4+4 = 21 = missing number