Math
posted by Kati .
A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the tree?

We will solve the problem by proportions.
Let the height of the tree be x, then
x/5 = 1/0.4
Crossmultiply to get
x=5*1/0.4=12.5 m.
Thus the tree is 12.5 m. tall