Easy we use fractions or seomthing find how many people liked brownies out of all those surveyed find how many people survayed surveyed=39+15+69+60=183 brownies=39 39/183=13/61=brownies/all surveyed
13/61 will be liking brownies
13/61 out of 1600 13/61 times 1600 20800/61=people who like brownies 340.98=people who like brownies about 341 people like brownies
So if 39 people said brownies, 15 said pretzels, 69 said potato chips, and 60 said another food, that's 183 people total. Put in percents; Brownies: 21.3% Pretzels: 8.2% Potato Chips: 37.7% Other: 32.8%
If you multiply these figures by the 1600 people coming, and you have your predictions.