Respuesta :

iby909
5*8=40=80%
0.5*4=2=4%
40+2=42
42/50=42:50=21:25

7.5*90=67.5
0.75*6=4.5
67.5+4.5=72
72/75=72:75=24:25

21:25,24:25

b is better