Respuesta :
Homework = 3/4 hour = 9/12 hour
Piano = 5/12 hour
9/12 - 5/12 = 4/12 hour = 1/3 hour = 20 minutes
So she did homework 20 minutes longer than practicing piano
Homework = 3/4 hour = 9/12 hour
Piano = 5/12 hour
9/12 - 5/12 = 4/12 hour = 1/3 hour = 20 minutes
So she did homework 20 minutes longer than practicing piano