First find the total weight of the big antacids: 2 grams/antacid * 2 antacids = <<2*2=4>>4 grams
Then convert that weight to milligrams: 4 grams * 1000 mg/gram = <<4*1000=4000>>4000 mg
Then multiply that number by 5% to find how much zinc is in the big antacids: 4000 mg * 5% = <<4000*5*.01=200>>200 mg
Then find the total weight of the smaller antacids in milligrams: 3 antacids * 1 gram/antacid * 1000 mg/gram = <<3*1*1000=3000>>3000 mg
Then multiply that number by the percent of zinc to find the amount of zinc in the small antacids: 3000 mg * 15% = 450 mg
Then add the zinc Jerry gets from each set of pills to find the total amount of zinc he eats: 450 mg + 200 mg = <<450+200=650>>650 mg
#### 650