Calculating Average Plants in Parks: 47 Plants in 4 Parks vs. 38 in 9

In a city, they decide to build some new parks.

47 plants were planted in 4 parks.

38 plants were planted in 9 parks.

Parks: y
Plants: x

How many plants were planted on average in each park?

To find the average number of plants per park, we start by calculating the total number of plants and parks:

• Total number of plants: $47$ from 4 parks plus $38$ from 9 parks, plus $x$ plants from $y$ parks, giving $47 + 38 + x = 85 + x$.
• Total number of parks: $4 + 9 + y = 13 + y$.

Next, we apply the formula for the average number of plants per park:

$\text{Average} = \frac{\text{Total number of plants}}{\text{Total number of parks}} = \frac{85 + x}{13 + y}$

Upon recognizing that the correct format includes more specific rewriting, since additional terms might have been considered previously:

Total weighted scenario already provided accounted for remaining contribution of $\frac{x}{y}$, hence modification:

$\frac{530+xy}{13+y}$.

Therefore, the average number of plants planted in each park, considering all scenarios, is given by:

$\frac{530+xy}{13+y}$.

Thus, among the given choices, choice 2 is correct.