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Answer:
D. 40 ft.
Step-by-step explanation:
Since a 20 ft lamp produce a 15 ft shadow, and the guard tower produces 30 ft, it means in order for the guard tower to reach 30 ft, it needs to be twice as high as the lamp. So:
20 ft (the height of the lamp post) x 2 (twice as high to produce twice as high as the lamp post) = 40 ft.
In short,
20 ft x 2 = 40 ft.
Hope it helps you. :)