The missing dimension, x, is 7.5.
if you take 45 and divide it by 6 you can get the next dimension needed to get the full number, 45. You can also find it by dividing 35 and 4. I hope this helps.
7.7 the answer in 7.7 because 2+5 = 7 and 3+4= 11
Its Letter A see photo for solution
