Horizontal addition
Row 1 a + 12 + b +6 =37

Row 2

Row 3

Row 4

Now Let us add the columns
Column 1

Column 2

Column 4

Column 2

Hence, Video games under 10-12 is c=17, gotten from column 2
Vertical total under 16-18 is h=35 gotten from column 4
Hence, the horizontal total of the video game is 52
Since h is gotten, we can solve for 7 to 9 vertical total

Hence, the 7 to 9 vertical total is 29

Hence, Darts under 7 to 9 is 4
Darts under 13 to 15 is b

Hence, Darts under 13 to 15 is 15
Basket ball under 13 to 15 is e

Hence, Darts under 13 to 15 is 14
Video Games Horizontal total is d,

Hence, the Horizontal total of the Video game is 52
Basketball horizontal total is f
40+e=f

Hence, the horizontal total of the Video game is 54.
Hence, the above table fill the empty space