Answer:
72 7th graders
Explanation:
7th Grade:
18(Yearbook) + 20(Student Council) + 2(Jump Rope) = 40 students total in 7th grade
If staying true to the ratio when there is 200 7th graders then the amount of 7th graders involved in the year book will be this:
40 current students: Required 200.
200/40 = 5
Multiply all current club values by 5:
18x5 = 90 7th graders in year book
20x5 = 100 7th graders in student council
2x5 = 10 7th graders in jump rope.
= 200 total students.
How many more 7th graders are in the year book?
90 students - 18 students = 72 7th graders in year book