How many donors participated in the blood drive

Question

13 donors had type o blood. Thia was 44% of the total number of donors who gave blood that day. How many donors participated in the blood drive?

Answer 1

13 = .44T

T = 13/.44 = 29.54545...

total number of donors = about 30, or maybe 29

44% of 30 = 13.2

44% of 29 = 12.76

30 is slightly closer, probably better answer.