Determina el área de un cuerpo, si al aplicársele una fuerza de 200,000 N, recibe la acción de una presión equivalente a 50,000 Pa.

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?