Question

a 6 feet tall boy cast a shadow of 9 feet at the same time of the day if the shadow of a tree measures 21 feet what is the height of the tree

Answer 1

Ratio of object to it's shadow = 6/9 = 2/3

So, height of the tree would be: 21 * 2/3 = 14 feet

So, your final answer is 14 feet

Hope this helps!