 
 <translate> In one building, there are 4 - 1 = 3 floors that have 5 apartment units each. Mr. Resty has a total of 3 floors x 5 units = 15 apartment units from the 2nd to 4th floor in one building. So, in one building, there are a total of 15 + 2 = 17 apartment units. Therefore, Mr. Resty has a total of 17 x 2 = 34 apartment units in his 2 buildings.
Thus, the answer is 34. <ibo> N'otu ụlọ, e nwere 4 - 1 = okpukpu 3 nke nwere ụlọ obibi 5 n'otu n'otu. Maazị Resty nwere ngụkọta nke ụlọ 3 x ụlọ 5 = ụlọ obibi 15 site n'okpukpu nke abụọ ruo nke anọ n'otu ụlọ. Ya mere, n'otu ụlọ, e nwere ngụkọta nke 15 + 2 = 17 ụlọ. Ya mere, Maazị Resty nwere ngụkọta nke ụlọ obibi 17 x 2 = 34 n'ụlọ ya abụọ. N'ihi ya, azịza ya bụ 34. 