Question

A tree cast a shadow 21feet long , while Enzo, who is 5 feet tall , cast a shadow 6 feet long

Answer 1

Answer: The tree is 17.5 ft long.

Let x be the tree's length.

Form the proportion. 
x/21 = 5/6

Solve for x by cross-multiplying.
6x = (21)(5)
6x = 105
x = 17.5