Question 892324
Set f = number of females
    m = number of males
f = m + 48
{{{13/5 = f/m}}}
{{{13/5 = (m + 48)/m}}}
do cross products
{{{13m = 5m + 240}}}
add -5m to each side
8m = 240
divide each side by 8
 m = 30
Since f = m + 48, f = 30 + 48 = 78
The total number of teachers is m + f = 30 + 78 = 108