Respuestas

2012-10-11T03:34:25+02:00

mm... regla de tres:

 

100%/75%  =  20/x

100x= 20(75)

x=1500/100

x=15

2012-10-11T03:36:05+02:00

100/75  =  20/x

100x= 20(75)

x=1500/100

x=15