A simple math problem, please tell me how the answer came about!

10 empty bottles, 3 bottles of beer + 1 empty bottle, 4 empty bottles, 1 bottle of beer + 1 empty bottle, 2 empty bottles.

Then borrow an empty bottle for 1 bottle of beer, and return the remaining empty bottles.

So a total of 15 bottles of beer.

It should be 14.

10 = 3 + 3 + 3 + 1 for 3 bottles.

3. Empty bottles and replace them with another bottle.

In the end, there are two empty bottles left.

If it's 15, you have to borrow one bottle in the end, and then replace three empty bottles with one bottle and return it.

Supplement: Of course not, you have to pay it back if you borrow it, for example, if you borrow three bottles, after drinking, you can only return one bottle to him.

He drank 9 bottles first, then changed back to 3 bottles, he drank 3 more bottles, and then changed back to 1 bottle, plus the original 1 bottle, for a total of 9+3+1+1 14

1.Drink 10 bottles first.

An empty bottle for 3 bottles of wine, and after drinking 3 more bottles, there are 4 empty bottles left.

3.I took 3 empty bottles for 1 bottle of wine, drank 1 more bottle, and there were 2 empty bottles left.

4.Borrow an empty bottle, a total of 3 empty bottles for 1 bottle of wine, and drink 1 more bottle, at this time there is 1 empty bottle left.

5.Return the remaining empty bottles.

10+3+1=14 Now there are 2 empty bottles, drink 1 more bottle and give 3 empty bottles to the boss is 15

Exchange 9 empty bottles for 3 beers, and then 3 empty bottles for 1 beer.

After drinking, there are now 2 empty bottles left, exchange 2 empty bottles for a bottle of beer, and return the bottle to the seller after drinking.

Do the task and make a soy sauce

By the way, 22 this buddy is right.

I won't! You don't mean simple, simple is not it?

Set the original price to x

50 pieces require 50x according to the original price

After 20% discount, 50x* is required

This makes it possible to list the equations.

Solution x = meta.

Each one is cheaper by 6 50=yuan.

Because of the 20% discount, each one is 20% cheaper

The original price is RMB.

The original price is set to a

then 50a (

solution a = yuan).

A: $6 per pencil.

Let the original price of the pencil be x 50x-50*, x=

The original price of the pencil is RMB.

Set the original price to $x.

50x (x = original price is RMB.)

The original price of each pencil is $x.

50x (x = the original price of each pencil is RMB.)

The answer is 600.

This rule looks at the circles inside the triangle.

123 "0" circles.

456 "1" turns.

789 "3" circles.

10 18 ？It should be 6 laps, so it's 600

Answer: There is a question: the iron is completely submerged in water. 24 27 3 16 6 24 120 cubic decimeters.

120 16 dm.

Dm. Or solution: 24 16 decimeters.

First find the height of the cuboid container raised by an iron block with a volume of 24 cubic decimeters, and add the height of the original water to solve it

Solution: 24 16 + 6, , = decimeter)

A: At this time, the water surface is high in decimeters

Hello, solution: the volume of water loaded is: 16 * 6 = 96 cubic decimeters;

After adding iron, the water surface will rise, at this time, the whole volume should be the original volume of water plus the volume of iron, that is: 96 + 24 = 120 cubic decimeters;

Now the volume is calculated, divided by the bottom area of the container and the height of the water surface: 120 16 = decimeters.

24/16=

6+ decimeters) If the iron is not completely submerged, the water surface will be less than decimeters.

Putting in a 24 cubic decimeter of iron is like adding 24 cubic decimeters of water.

Solution: Because the bottom area of the cuboid is 16 square decimeters, the water height is 6 square decimeters.

The volume of the iron block is 24 cubic decimeters, which is equivalent to an increase of 24 cubic decimeters in the volume of water, and the increased height is h=24 16=decimeters) Therefore, the height of the water surface at this time is 6 + decimeters).

Several levels are more in line with the specification change V brake.

My method is the easiest! Since everyone cuts a tree the same....A total of n days were cut, and the nth person cut n pieces....Then only 81 of the total n squared options is a perfect squared number....

d 81

This kind of question that goes to m first, and then removes n/1, the total number is generally a multiple of 9.

You can try it with the D 81.

On the first day, one plus one-tenth, that is, the total number is ten plus one;

The next day is two and one-tenth, i.e. ten plus two.

The whole number for the first day is eighty (10-2).

So the answer is.

Hello: You can know that the second bridge is more than the first: 600 5 60 = 50 meters, so the length of the first bridge: (50 + 50) (2-1) = 100 meters, the second bridge length: 100 + 50 = 150 meters.

If you don't understand, you can ask.

If it helps, remember to adopt it, thank you.

Good luck with your studies!

600 60 = 10 meters in seconds.

First: 10 5 + 50 = 100 meters.

Second: 100 2-50 = 150 meters.

The length of the first bridge is 50 + 5 * 10 = 100 meters.

The second bridge is 100*2-50=150 meters long.

Because b is on the tenth, a is on the first bit, and 10b+a