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The missing total for the question mark is 21. I say this because if you look at the first line across it’s 2 triangles and 2 squares. In total they add up to 28.If you then look at the second line going down you notice it is all the same except one of the triangles have been swapped for a square and the total is 30. Therefore, if the space between our first and second totals is 2, the square must be two higher than a triangle.Then you take away 4 from 28 so that we can pretend all the numbers on the row are equal. If you divide 24 (28-4) by four, you have 6.You then have a strong suspicion that the triangle is 6 and the square is 8. If you try out your theory on the second line that goes down,you prove your theory right. You then go to the line with a total of 22.It is a triangle a square and to circles.if you minus 6 and 8 from 22 you have 8. If you divide it by two you have four and that is a circle. Then all you have to do is find out what a hexagon is.You should then go to the line with a total of 23 and minus 8, 4 and 4 from 23 and have 7. Then you go to the line with a mystery total. It’s 6+7+4+4 which equals 21.