4.) Joe, Sam and Chris are all brothers. Joe is 5 years older than Chris and Sam is three times as old as Chris. The sum of their ages is 20. How old is Sam?

The elmina wilson company produces spaghetti sauce that is used in restaurants. the fixed costs total $1,329,050. the selling price per 64 oz. can of sauce is $12.40. the variable cost per can is $4.80. what is the break-even point in number of cans?