Question

The ratio of black walnut to red oak trees at a tree farm is 4:5. The tree farm has 1200 black walnut trees. How many black walnut and red oak trees does the tree farm have altogether?

Answer 1

`2700` trees

Explanation:

Let the common factor be `x.`
Hence the number of black walnut trees = `4x`
and red oak trees = `5x.`

Now as per question, `4x = 1200`

or, `x = 1200/4 = 300.`

Therefore together the farm has:

`(4 + 5)*x = 9*300 = 2700` trees