Question

a flagpole casts a shadow 10 ft long. a girl standing next to the flagpole casts a shadow 2.5 ft long. if the girl is 5 ft tall how tall is the flagpole

Answer 1

ratio problem:
10ft shadow/x tall = 2.5 shadow/5 ft
cross multiply and solve

50 = 2.5x
x = 20 feet