un productor de aceite carga toda su produccion en tres bidones .el primero lleva las 3/5 partes del total; el segundo, la tercera parte del resto de la produccion; y el tercero contiene 2400L de aceite. ¿cuantos litros de aceite hay en los tres bidones?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?