Which is correct regarding the angles of the triangle?

One of the properties of triangle is the opposite of the largest angle is the longest leg and the smallest angle is opposite the shortest leg. 
Given the three sides of the triangle with its corresponding angle, we have:

(2m+3) = m∠X
(m-3)    = m∠Y
(m+8)   = m∠Z

assign value for m; let m = 6
 
 2(6)+3 = 15 =  m∠X
 6 - 3    =  3  =  m∠Y
 6 + 8   = 14 =  m∠Z

As the sides correspond to its angle, therefore, the largest angle is m∠X and the smallest is m∠Y

The correct one is m∠Y < m∠Z < m∠X 

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a