There are \(30\) students in the school choir at Pascal Middle School. Their conductor split them into two singing groups: altos and sopranos. In total there are \(13\) altos and \(17\) sopranos in the choir.
One day there were some students absent from choir practice. Their conductor noticed that more than half the students in the choir were present, and two-thirds of the students present were altos. How many students were absent from choir practice that day?
Themes: Data Management, Number Sense