x= costo de la pasta
y=costo del jabón
z=costo del champo
x-15=y Y. x-13=z
x+y+z =66
reemplazas:
x+(x-15)+(x-13) =66
13x =84
x=28
y=13
z=25
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x= costo de la pasta
y=costo del jabón
z=costo del champo
x-15=y Y. x-13=z
x+y+z =66
reemplazas:
x+(x-15)+(x-13) =66
13x =84
x=28
y=13
z=25