mac is 5 feet tall and cast a 4 foot 6 inch shadow. at the same time a nearby tree casts a 20 foot shadow what's the closest high to the tree

I will convert feet to inches.

4 feet, 6 inches = 54 inches

20 feet = 240 inches

5/x = 54/240

Let x = closest height of tree

54x = 5 (240)

54x = 1,200

x = 1200/54

x = 22.2222222222

The tree is about 22 feet tall.