 
<translate> Ebe ọ bụ na ụlọ ise nwere windo anọ, nke a na-eme ka windo 20 n'ihi na 4 * 5 = windo 20. Ebe ọ bụ na ọnụ ụlọ 8 nwere windo 3, nke a na-eme ka windo 24 n'ihi na 8 * 3 = windo 24. Enwere windo 78 fọdụrụ n'ihi na 122 - 20 - 24 = 78. Ya mere, enwere ụlọ iri atọ na itoolu nwere windo abụọ n'ihi na 78 / 2 = 39. Azịza ya bụ: 39. <eng> Since 5 rooms have 4 windows, this accounts for 20 windows because 4 * 5 = 20 windows. Since 8 rooms have 3 windows, this accounts for 24 windows because 8 * 3 = 24 windows. There are 78 windows left over because 122 - 20 - 24 = 78. Therefore, there are 39 rooms with 2 windows because 78 / 2 = 39.
The answer: 39. 