Me . i have tried so hard and i need .

Ok, for this one...  see the picture

Step 1:  Find angle R by adding angle Q and P then subtract from 180 (all angles add to 180).  That gives us R angle of 70 degrees.

Step 2:  Find angle QRX by subtracting angle R from 180 (the 2 angles that make up the straight line will add to 180).  180 - 70 = 110 degrees.

Step 3:  Find y by setting the equation to the answer we found in step 2.
y + 25 = 110
y = 85 degrees

Check out the picture.  It should help.