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La edad de Gustavo es "y"
x/y = 2/3 x = 2/3 y
x + y = 20
2/3 y + y = 20
2/3 y + 3/3 y = 20
5/3 y = 20
y = ( 20 ) ( 3 ) / 5
y = 12
calculamos "x"
x = 2/3 ( 12 ) = (2 ) ( 12 ) / 3
x = 8
Álvaro tiene 8 años
Gustavo tiene 12 años