For every 13 birds born there are 2 animals born. there were 44 fewer birds born last month, so how many animals were born?

For every thirteen birds born there are 2 animals. 
so
13:2 is your ratio

There are fewer than 44 birds, so x > 44
43/13 = 3.3, or 3 birds for every 2 animals
2 x 3 = 6

There are 6 animals that were born

hope this helps

A= r2 × 3.14 11×11 ↓ ↓ 121 × 3.14 = 379.94 → 379.9