You and a friend want to know how much rope you need to climb a large rock. Your friend is 5.5 feet tall and casts a shadow that is 18 feet long. If the rock casts a shadow that is 209.5 feet long, calculate the height of the rock from the ground. Round your answer to the nearest foot. (Hint: make a drawing)

64 ft

18 ft

210 ft

219 ft

Question

Mathematics

Cortez Vang

8 January, 00:14

You and a friend want to know how much rope you need to climb a large rock. Your friend is 5.5 feet tall and casts a shadow that is 18 feet long. If the rock casts a shadow that is 209.5 feet long, calculate the height of the rock from the ground. Round your answer to the nearest foot. (Hint: make a drawing)

64 ft

18 ft

210 ft

219 ft

+2

Answers (1)

Know the Answer?

Tatiana Horne · Answer 1

The concept that is useful in order to answer this item is the concept of ratio and proportion. Let x be the height of the rock from the ground. We use the equation below to answer.

5.5 ft / 18 ft = x ft / 209.5 ft

The value of x from the equation is 64 ft. Thus, they will be needing approximately 64 ft of rope.