Calculate the expected frequencies of the genotypes BB,Bb, bb. Please Help!!! :)?

Well I think I get how to do this but the question is: A four based site for the restriction enzyme BanI is located within a large intron of the larval transcript of the gene coding for alcohol dehydrogenase in Drosophila melanogaster. at this site was found in 29 of 60 chromosomes ( that is, in 29/60 alleles) isolated from a population sampled at a market. Letting B and b represent the presence or absence, respectively, of the BanI site in a chromosome, and uming Hardy-Weinberg genotype frequencies, calculate the expected frequencies of the genotypes BB,Bb, and bb.