In a class of 28 students, 15 are girls. If 21 students clean their teeth daily and \(\frac{3}{5}\) of the girls clean their teeth daily, then state which fraction of boys are doing the same work daily.
1
\(\frac{2}{5}\)
2
\(\frac{4}{7}\)
3
\(\frac{4}{9}\)
4
\(\frac{12}{13}\)