Buoyancy of bottle Three bottles with the same density, material, shape and volume have vacuum, standard atmospheric pressure and high pressure (the same gas) inside. When they are thrown into the water, which one is more buoyant? The bottle does not deform

Buoyancy of bottle Three bottles with the same density, material, shape and volume have vacuum, standard atmospheric pressure and high pressure (the same gas) inside. When they are thrown into the water, which one is more buoyant? The bottle does not deform

High pressure, the first two floating on the water surface, buoyancy is equal to gravity, the latter in either case buoyancy must not be less than gravity, and the third gravity, so buoyancy

One bottle of soda is 1 yuan. Two empty bottles can be exchanged for one. How many bottles of soda can I drink for 19 yuan

19 yuan for 19 bottles of soda -- 19 bottles of soda
Change 9 bottles of soda, the remaining one - 28 bottles of soda
There are 10 bottles now, and 5 bottles of soda water are replaced - 33 bottles of soda water
Change 2 bottles of soda and the remaining one - 35 bottles of soda
There are three bottles, one for soda, and the remaining one - 36 soda
There are two bottles now, one bottle of soda instead - 37 bottles of soda
There's only one bottle left, so you can drink up to 37 bottles of soda for 19 yuan

One yuan for a bottle of soda! Two empty bottles can be exchanged for one bottle of soda! How many bottles of soda can I drink at most for 20 yuan! Why?

How many bottles of soda can you drink at most when you have 20 yuan? Solution 1: at first, 20 bottles are OK, then 10 bottles and 5 bottles are OK. Then 5 bottles are divided into 4 bottles and 1 bottle. The first 4 empty bottles are replaced by 2 bottles, and the second 2 bottles are replaced by 1 bottle

Three empty bottles for one bottle of soda. I bought 19 bottles of soda. How many bottles of soda can I drink?
Expression

19 bottles of gas and water, you can change 6 bottles of soda to 25 bottles
Among them, 6 bottles of soda water can be replaced by 2 bottles of soda water. 2 bottles of soda water are two empty bottles, and one empty bottle in front can be replaced by another bottle of soda water
19+(19/3)=(19+6)...1
(6+1)/3=2..1
3/3=1
Finally, 28 bottles of soda