1) Calculate the rotation angle of 1 kg of vegetables on the scale and multiply it by 6;

(2) Solve the equation with the sum of two angles equal to 90. Solution: Solution: (1) It is known that the teacher puts 6 kilograms of vegetables on the scale, and the degree of turning the pointer is:18010× 6 =108.

(2) Suppose Aunt Liu puts X kilograms of vegetables on the scale for the first time.

So 180 10? x+ 180 10=90，

The solution is x = 4.

So, Aunt Liu put 4 kilograms of vegetables on the scale for the first time.