Can You Help Solve Hardy-Weinberg Problem?

Imagine that a group of 20 friends build a boat, colonize an unpopulated oceanic island, and found a population. By chance, four of the 20 people are heterozygous for the PKU allele, but no one in the group has PKU. ume that q, the frequency of the recessive k allele that causes PKU, is 0.024 in the mainland population where these founders originated. How many times more frequent is the p allele in this newly founded island population?