Ten boxes of apples, nine boxes of 10, each ten jin, there are nine in one box. You can weigh them, but you can only weigh them once, and you can only put all the apples together or put them down. How can you find the frame of nine apples?

Ten boxes of apples, nine boxes of 10, each ten jin, there are nine in one box. You can weigh them, but you can only weigh them once, and you can only put all the apples together or put them down. How can you find the frame of nine apples?

One for the first basket, two for the second basket and ten for the tenth basket
Weighing m,
（55-m）*10
The number obtained is the number of the basket of 0.9 Jin

Two baskets of apples are 100 kg in total. If you take 1 / 4 from the first frame and put it into the second frame, the apples in the second frame are 2 / 9 more than those in the first frame. How many kg of the original apples in the first frame?
You can't use equations. Use arithmetic!

100 / (1 + 1 + 2 / 9) = 45 (box)
45 / 3 / 4 = 60 (box)
A: the first box contains 60 kg of original apples

The ratio of a to B is 4:5. If 6 kg is taken from B and put into a basket, the mass ratio of the two baskets is 5:4. How many kg are the two baskets?
I'm new here

It turns out that the armour basket is the total number
4 ÷ (4 + 5) = 4 / 9
Now the armour basket is the total
5 ÷ (5 + 4) = 5 / 9
Two baskets of apples
6 ÷ (5 / 9-4 / 9) = 54 (kg)