 
<translate> Buru ụzọ chọpụta nọmba ala Charlie site n'ịkewa nọmba ala Frank site na 4: 16 / 4 = 4. Mgbe ahụ, gbakwunye 2 iji chọta nọmba ala nke Dennis: 4 + 2 = 6. N'ihi ya, azịza ya bụ 6. <eng> First find Charlie's floor number by dividing Frank's floor number by 4: 16 / 4 = 4. Then add 2 to find Dennis' floor number: 4 + 2 = 6.
Thus, the answer is 6. 