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Julio = x
Cristina = x+10
Pedro = x+13
entre todos tiene 88
2x + x + x +10 +x +13 = 88
5x + 23 = 88
5x = 88 -23
5x = 65
x = 65/5
x = 13 Julio
Arantrax = 2x = 2(13) = 26
Cristina = x+10 = 13+10 = 23
Pedro = x+13 = 13+13 = 26
Listo
Julio:13
Pedro:26
Arantxa:23