A hospital employs a total of 77 nurses and doctors. The ratio of nurses to doctors is 9:2. How many nurses are employed at the hospital? How many doctors are employed at the hospital?
A chart is the easiest way to understand this question.
Since in the row labeled "Total" to move from column 1 to column 2 we would multiply the 11 by 7, so for each of the other rows.
Multiply the 9 by 7 to get 63 nurses, and multiply the 2 by 7 to get 14 doctors. Notice the total of nurses and doctors is
Therefore there are 14 doctors.