there are 3 teaspoons in one tablespoon then 4 bottles have a combined total of 4 tablespoons.
if you have 3 teaspoons in one bottle and you have 4 bottles that will make 12 teaspoons, for every 3 teaspoons it is equal to one tablespoon. so you divide 3 into 12 which will make 4 tablespoons.
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