Question

mary is 5ft 9 inches tall. she casts a 2 ft shadow. the tree casts a 7 foot shadow. how tall is the tree?

Answer 1

9 inches * (1 foot / 12 inches )
= .75 foot

so

5.75 / 2 = h/7

multiply both sides by 14
5.75 * 7 = 2 h

h = 7.75 * 7/2

h = 27.125
which is 27 1/8 feet
which is 27 feet 1 and 1/2 inches :)