Respuesta :

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Let x = amout of fresh water required
The amount of the salt remains the same
.05(30) = .015(x+30)
1.5 = .015x + .45

1.5 - .45 = .015x
1.05 = .015x
x = 1.05/.015
x = 70 liters of fresh water

check solution
.05(30) = .015(100)
1.5 = 1.5