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1/3 = 1 / 1 + (gram per 40)
1/3 (1 + (gram per 40) = 1
1/3 + gram per 120 = 1
gram per 120 = 1 - 1/3
gram per 120 = 2/3
gram = 2/3 x 120
gram = 2 x 40
gramNaOH = 80 gram