If a>b, and if c>d, then....
If 10>9, and if 6>5, then....you might conclude that 10>5, but...
If 10>9, and if 15>14, then....can you say that 10>14?
If 10>9, and if 6>5, then.... could say that 10+6 > 9+5 or 10-6 > 9-5 or 10*6 > 9*5 or 10/6 > 9/5 ??? One or more of these is not true. One or more are true.
I imagine you are to draw conclusions similar to these, only using a, b, c and d. In other words...
If a>b, and if c>d, then....is a+c always greater than b+d? What if a, b, c, and d are negative numbers?