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Abrigo = s
RESOLVIENDO...
s + 20 + s = 300
s + s + 20 = 300
2s + 20 = 300
2s = 300 - 20
2s = 280
s = 280/2
s = 140
REEMPLAZANDO...
s + 20 =
140 + 20 =
160
Respuesta.
El traje costó 160 euros
El abrigo costó 140 euros
a= x
x + x-20 = 300
2x = 320
x =320/2
x = 160
⇒ abrigo costo 160 euros
traje 160-20 = 140 euros