Population genetics problem?

Question

A new university on a South Pacific island recruited 700 faculty members from colleges in Germany and Cuba. 500 of the faculty came from German. The faculty is 50% male. You notice that 90 of the German and 75 of the Cubans express a peculiar trait of rolling their eyes up into their sockets when asked a stupid question. You study the trait and discover it is always due to the expression of a dominant allele at a single gene called Sih. The Sih locus is in Hardy Weinberg equilibrium in both Germans and Cubans. After a few years the faculty have married one anther. Among the 1000 progeny from theses marriages, how many children do you expect will express the eye rolling phenotype?

Answer 1

German pop 500 => 1000 alleles
90 are SS or Ss with 180 alleles
410 are ss with 820 alleles
f(s)= (820 + 1/2 Ss) / 1000=q
f(S) = (180 - 1/2Ss) / 1000=p

f(Ss) = 2pq = 2[(820 + 1/2 Ss) / 1000] x [(180 - 1/2Ss) / 1000]
p+q=1

Cuban pop 200 with 400 alleles
75 are SS + Ss
125 are ss with 250 alleles
f(s)= (250+1/2 Ss) / 400