Thirtieth Wedding Anniversary What Kind Of Problem Is This? Requiring Only Integer Answers]? ?

What kind of problem is this? requiring only integer answers]? ? - thirtieth wedding anniversary

Chris and his sister, Ruby, are planning a ceremony to mark the anniversary of his parents three decades. Estimated up to 100 pounds of meat, fish and poultry for the buffet will need, but spend only $ 100 for it. Be set at 3 pounds boneless chicken for $ 2 price, rolled roast 2 pounds for $ 7, and fillets of salmon at $ 8 per pound. How many pounds of each series to buy, where to get 100 pounds for up to $ 100?
Thanks