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------ = ------- ⇒ a = 4/5 b
b 5
a + b = 90 reemplazando
4/5 b + b = 90 multiplicando por 5
4b + 5b = 450
9b = 450
b = 50
luego
a= 4/5 (50) = 40
hallando 2a - b
2(40) - 50 =
80 - 50 = 30