Microevolution Genotype Frequency

For the following question, assume that the population that you are observing is in Hardy Weinberg Equilibrium (not evolving).
If a population starts out with 7 Black Moths, 8 Grey Moths, and 30 White Moths,
How many grey moths to you expect in the next generation if the population is 45?
Round your answer to the nearest 1/100th (two decimal places)

Microevolution Genotype Frequency