Please ans this

4>
Given:
           a=40
           b=110
           c:d=3:4

To find:
c and d.

Solution:

Let c be 3x and d be 4x

a+b+c+d=360     - Angle sum property of quadrilateral
40+110+3x+4x=360
150+7x=360
7x=360-150
7x=210
x=210 
      7
x=30

c=3x=3*30=90
d=4x=4*30=120

Hope it helps !
Cheers !