You are planting 12 oak trees 15 maple and 9 spruce in a park you want to plant equal group of without mixing types what is the greatest number planted per group?

To find the greatest number of trees you can plant in equal groups without mixing types, you need to find the greatest common factor (GCD) of 12, 15, and 9.

Here's how to find the GCD:

1. Factor each number:

* 12: 1, 2, 3, 4, 6, 12

* 15: 1, 3, 5, 15

* 9: 1, 3, 9

2. Identify the common factors:

* The common factors of 12, 15, and 9 are 1 and 3.

3. The greatest common factor is 3.

Therefore, the greatest number of trees you can plant per group without mixing types is 3.