Lupe gives her boyfriend Bob a box of candy for Valentine's Day. The box Bob received contains 12 "chewy centers" and 12 "creamy centers." As Bob opens it, he realizes that he would have been just as happy to have fewer pieces of candy if more of them were chewy. In fact, if the box contained 13 chewy pieces and 8 creamy centers, he would have been just as happy with it. How many cream centered pieces of candy does Bob consider as equal in value to a single chewy piece of candy?