Final answer:
There are 19 horses at the riding academy that day.
Step-by-step explanation:
Let's represent the number of horses as 'h' and the number of people as 'p'.
From the given information, we can create two equations:
- h + p = 37 (equation 1)
- 4h + 2p = 112 (equation 2)
We can solve these equations simultaneously to find the values of 'h' and 'p'.
Multiplying equation 1 by 2, we get:
2h + 2p = 74 (equation 3)
Subtracting equation 3 from equation 2, we get:
2h = 38
Dividing both sides by 2, we find that h = 19.
Therefore, there are 19 horses at the riding academy that day.