To find the number of horses the trainer can train, we can set up the equation based on the information given:
Let \( h \) be the number of horses that can be trained. Since each horse requires 5 mints for a training session, the equation becomes:
\[ 5h = 42 \]
Now, to solve for \( h \):
\[ h = \frac{42}{5} \] \[ h = 8.4 \]
Since the number of horses must be a whole number, and you cannot train a fraction of a horse, the solution \( h = 8.4 \) is not viable.
Thus, the correct formulation and conclusion is:
5h = 42, so h = 8.4 horses, which is not viable.
This means that the horse trainer can train a maximum of 8 horses (using 40 mints) and will have 2 mints left over, which limits her from training a 9th horse.