Question 133063
if a 5 foot 6 person cast a 11 foot shadow and a nearby tree casts a 20 foot shadow how tall is the tree
5 feet 6 means 5 feet and 6 inches.   Change 6 inches to .5 ft (1/2 foot)

Write a proportion with the given information.   There is more than one way to write this proportion.   I will write it as:

person's height /person's shadow = tree's height/tree's shadow

5.5/11 = x/20    I used x for the unknown height of the tree.
                  Cross multiply
11x = 110         Now divide both sides by 11
x=10