The mass of hummingbirds is 4,000 milligrams use the proportion to convert 4,000 milligrams to grams
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You need to make an inequality. You know 5 pounds will serve 14 people but you don't know how much you need to serve 49 people so you need to set up the equation 
. You then cross multiply to get 
. Finally you divide 14 on both sides to get x=17.5 lbs of pasta salad