Question

1. A health department estimates that 8 vials of malaria serum will treat 100 people. At this rate, how many vials are required to treat 175 people? Write your answer as a complete sentence

Answer 1

This is a proportion..
8/100 = x/175 --- 8 vials to 100 people = x vials to 175 people
now we cross multiply
(100)(x) = (8)(175)
100x = 1400 -- now divide both sides by 100
x = 14

If 8 vials of malaria serum treats 100 people, then 14 vials treat 175 people.