Esther the Clown does face painting at the city carnival. She paints \[7\] faces every \[21\] minutes and spends the same amount of time painting each face.
Write an equation that relates \[f\], the number of faces she paints, and \[m\], the
amount of time, in minutes, she spends painting each face.
If Esther paints 7 faces every 21 minutes, then the amount of time she spends painting each face is \(\frac{21}{7} = 3\) minutes per face.
So the equation that relates \(f\), the number of faces she paints, and \(m\), the amount of time she spends painting each face, is \(f = \frac{m}{3}\).