 
 <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. <hau> A cikin wani gini, akwai 4 - 1 = 3 benaye wanda ke da gidaje 5 kowannensu. Mista Resty yana da jimillar hawa 3 x raka'a 5 = raka'a 15 daga hawa na 2 zuwa na 4 a cikin gini ɗaya. Saboda haka, a cikin wani gini, akwai jimillar 15 + 2 = 17 gidaje. Saboda haka, Mista Resty yana da jimillar 17 x 2 = 34 na gidaje a cikin gine-ginensa biyu. Saboda haka, amsar ita ce 34. 