The number of redwood trees in a certain triangular valley along the

Jedediah Smith River is believed to have changed very little over the last thousand centuries. The expectation of life of trees that survive to the age of 10 is a further lifespan of 500 years. Trees about age 10 can be recognized because they are about as tall as a human adult. Suppose there are 2000 trees in the valley as tall or taller than human adults. How many 10-year-old trees should you expect to find in the forest?