<image>As shown in the image, there are three balances. By observing the first two balances, it can be found that 5 "△"s are as heavy as 3 "○"s; 1 "○" is as heavy as 1 "△" and 2 "□"s. Thus, it can be inferred that 1 "△" and 1 "○" are as heavy as ____ "□"s.
