Y=145
Explanation:
A triangle’s angles add up to a total of 180 so you would subtract 55 from 180 and then subtract 90 because of the right angle, then you would end with x=35. Since x and y are supplementary they add to 180...so then you subtract 35 from 180 and then you get y=145.
The larger box is 5x bigger than the smaller one.
10 3/4
10 x 4 = 40
40 + 3 = 43
43/4 is your answer
Hope this helps