Answer:
18. 368 students
19. 16
20.
Explanation:
18.
students : faculty
23:5
x : 80
in total, there are 23+5 parts = 28 parts
5/28 = 80 faculty members
so 23/28 = x students
so use the find for one method.
If 5/28 = 80, then
80/5 = 1 member
so to find for 23 members,
80/5 × 23
=368 students
19. 640/40 = 16
20.
h = height of tree
h = 8.5 shadow
3 = 3.75 shadow
If 3.75 = 3
then 1 ft shadow = 3/3.75
then 8.5 ft shadow = 3/3.75 × 8.5
=6.8 ft tree.
proportion: 3/3.75 = h/8.5
answer: 3/3.75 = 6.8/8.5