Complete question :
Last year there were 221 students and 13 teachers at Hillard School. This year there are 272 students. The principal wants to keep the same student-to-teacher ratio as last year. Which proportion can the principal use to find x, the number of teachers needed this year?
Answer:
221 / 13 = 272 / x
Explanation:
Given that :
Last year:
Number of students = 221
Number of teachers = 13
Last year:
Number of students = 272
Number of teachers = x
To keep the same student to teacher ratio :
We equate the ratio for both years :
221 / 13 = 272 / x
221x = 272 * 13
221x = 3536
x = 3536 / 221
x = 16