Question

this question was on a practice exam and I got 720 ml as the answer, however that was wrong. Can you explain how to go about solving it?

this is the question: A patient suffering from a duodenal ulcer may show an HCl concentration of 80 x 10-3 M in their gastric juice. If their stomach receives 3 liters of gastric juice per day, how much medicine containing 2.6 g of Al(OH)3 per 100 mL must they consume to neutralize the acid? (Mol wt: Al(OH)3 = 78, HCl = 36.5)