Answer:
The second model, and the amount of exhibits the aquarium has is 40.
Explanation:
The model is an easy one to figure out, 36 is 90% of the exhibits, not 100%.
Now for the second part : 36 out of what is 90%? (what is the 100%?)
36 out of X is 90%
Equation: Y/X = P%
Solving our equation for X
X = Y/P%
X = 36/90%
Converting percent to decimal:
p = 90%/100 = 0.9
X = 36/0.9
X = 40