If a population has 6 homozygous dominant individuals, 16 heterozygous individuals and 10 homozygous recessive individuals with regard to a certain gene, then how many dominant alleles are in the population?

You take 6 times 2 because homozygous dominant means 2 dominant alleles, then add 16 because heterozyous dominant is 1 dominant allele. You dont need to do anything with the 10 homozygous recessive because they are both recessive alleles.