In a hypothetical population of 1,000 people, tests of blood-type genes show that 160 have the genotype aa, 480 have the genotype ab, and 360 have the genotype bb. what is the frequency of the b allele?

This question can be solved using Hardy-Weinberg equation. The equation would be:
a+b=1
a^2+2ab+b^2=1

There are 360 individual with genotype bb which means
b^2=360/1000
b=√0.36= 0.6

The frequency of b allele would be: 0.6

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