The weight ratio of Xiaohong to Xiao Fang is 5: 6, and Xiaohong is lighter than Xiao Fang (②). ①5 1.26 1.35 6.46.

A is a non-zero natural number. In the following formula, the number of (2) is the smallest. ①ax5 4②X \u 5 43A \u 5 14a 4 ax 1

Add 5g salt and 10g water to the salt water with a salt content of 30%, and the percentage of salt in the salt water is (①). ① More than 30% ② Equal to 30% ③ Less than 30% ④ Uncertain.