Answer:
There were 14 birds
Explanation:
Be
x = number of birds
y = number of cats
4$*x + 6.5$*y = 212$ (total spent on thursday)
x + y = 38 (total number of birds and cats)
y = 38 -x
4$*x + 6.5$*(38 -x) = 212$
-2.5$ x = -35$
x = 14 (number of birds)
y = 24 (number of cats)