25
2Largo+2ancho=Perímetro
2(10)+2ancho=70
20+2ancho=70
2ancho=70-20
2ancho=50
ancho=50/2
ancho=25
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25
2Largo+2ancho=Perímetro
2(10)+2ancho=70
20+2ancho=70
2ancho=70-20
2ancho=50
ancho=50/2
ancho=25