On a recent bird-watching expedition, Eriq and Salle saw several different kinds of waterfowl. They saw grebes ($G$), ducks ($D$), cormorants ($C$), geese ($E$), and spoonbills ($S$). They saw some of the birds at the beach ($B$), some at the lake ($L$), and some in a field ($F$). Write an expression to represent each of the following pieces of information.  

1. The total number of birds that they saw.

   Hint (a):

   The variables $G, D, C, E,\text{ and }S$ represent the number of these types of birds.

   Answer (a):

   Total Number of Birds: $G + D + C + E + S$
   OR
   $B + L + F$

2. The percentage of birds that they saw at the lake.

   Hint (b):

   $L$ represents the number of Birds they saw at the Lake.
   $B + L + F$ represents the total number of birds they saw.
   To find a percentage, divide the target number by the total possible.

3. The fraction of birds that were geese or ducks.

   Answer (c):

   ${\frac{\textit{G + D}}{\textit{B + L + F}}}$