Question

The student faculty ratio at a middle school is 10:2 The total of students and faculty is 520. How many faculty members are there at the middle school?

Answer 1

104,
We can divide 520/10 to get 52 (for the input),
And then multiply that number by 2 (for the criterion)
OR
Convert the ration to percentage, i. e. 20%, and find 20% of 520
OR
divide 520/4, because 10:2 is 1/5, and we are looking for the remaining fifth.