Un estudiante obtuvo las siguientes calificacion 5,7_6,2_4,6 obteniendo un promedio 5 calificaciones¿que nota obtuvo en la ultima prueba se esta coeficiente? Porfavor ayuda es para una hora

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120