Suppose we find a population with 60 AA individuals, 20 Aa individuals, and 20 aa individuals, what is the al?

70%, or answer B. The 60 zygous dominant individuals will donate an A every time, the 20 heterozygous individuals each have a 50% change of returning an A, and the zygous recessive have a 0% chance. 60x1+20x.5=70.