Answer:
7. option D
8. option D
Explanation:
7. we can assume the height of the radio tower to be x. We're given with its shadow,the height of the person and also their shadow. Since we have 3 known values and an unknown, we can make a proportion comparing the tower's height to the height of the person.
∴ 6/10 = x/ 400
⇒ x= (6 * 400)/10 = 240 feet.
8. The question is similar to the above question where again we have 3 knowns and one unknown. Let us assume the length to be x. We'll again compare the length of the two photographs and make it as a proportion.
∴ 4/6 = x/10
⇒ x = (4 * 10)/6 = 6.7 in
Hope that answers your questions!