Después de los entrenamientos uno de los amigos propone alquilar un campo mas grande cuyo costo es de 280 soles, el mayor de todos decide pagar la cuarta parte, el otro la quinta parte y el resto lo pagaran los demás equitativamente. ¿Cuánto pagara cada uno de ellos?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)