Question

The ratio of adults to kids in a school is 3 : 7. If there is a total of 200 people, how many of them are students? *

Answer 1

140 are students

Explanation:

let k = number of kids

set up proportion based on 7 out of 10 are kids

7/10 = k/200

cross-multiply: 10K = 1400

Answer 2

60 students 140 adults

Explanation:

so 200 into 3 : 7

first we just do this: 200 ÷ (3+7) = 200 ÷ 10 = 20

so a 1 in the ratio is 20 people

and theres 3 : 7

so 3 * 20 = 60

7 * 20 = 140

60 kids to 140 adults