Help with word problems for Algebra.

Question

a tree casts a 10m shadow. A signpost next to the tree casts a 4m shadow forming similar triangles. The signpost is 2.5m tall. how tall is the tree?

Answer 1

1.  draw the figure described by the words; label all lengths that are know.

2.  write a proportion based on two similar triangles and one variable representing the unknown tree height.

3.  solve