Resposta :
5
ar (Mg) = [(24 x 80) + (25 x 10) + (26 x 10)] / 100
ar (Mg) = [1920 + 250 + 260] / 100
ar (Mg) = 2430 / 100
ar (Mg) = 24,3
5
ar (Mg) = [(24 x 80) + (25 x 10) + (26 x 10)] / 100
ar (Mg) = [1920 + 250 + 260] / 100
ar (Mg) = 2430 / 100
ar (Mg) = 24,3