Answer:
Number of adult goats = 5
Step-by-step explanation:
Let the numbers of adult rabbits = R
and numbers of child rabbits = r
Let the numbers of adult goats are = G
and numbers of child goats = g
Now we will form the equations as per statements given in the question.
R + r + G + g = 40 -------(1)
R = 2G
g = 3G
R = r ⇒ r = 2G
Now we put these values in the equation 1.
2G + 2G + G + 3G = 40
8G = 40
G = 5
therefore there are 5 adult goats in the petting zoo.