Puzzle 30 yuan to stay in a hostel! Crazy math problems!

They paid a total of 27 yuan, (including the 27 yuan kept by the waiter) but the boss only charged 25 yuan, and the other 2 yuan was from the waiter. This kind of question can't be thought about according to the idea he gave, what is 27+2? 27 and 2 are not added together at all, they are two different concepts.

Three people make money: 9*3=27

The boss collects money: 25 + waiter kept 2 yuan = 27

You have been misled.

3 * 9 = 27 is the 25 yuan for the boss and the waiter to deduct 2 yuan (paid), plus 1 * 3 = 3 yuan in their own hands (not paid), exactly 27 + 3 = 30 yuan.

You have been misled.

This is a question similar to a mathematical paradox, where the question is asked after a change of concept. There is an unbreakable principle for this similar problem, which is the balance of payments in accounting.

Customer spending: 30-3=27

Store income: 25 + 2 = 27

The three of them spent a total of 27 yuan, and the boss took 25, so the waiter took 2 yuan.

You said that the waiter took 3 yuan, but in fact, the 3 yuan was in the pockets of 3 people, and it was the 3 yuan returned.

Which 1 yuan, I didn't understand what he asked.

Get together $30.

Gave 25 room charges + refunded 3 yuan + tips 2 yuan a lot, what do you want to ask.

The waiter's $2 early paid you 27-25

It's inexplicable.

25 (the cost of staying in a hostel) + 2 (the waiter's private stay) + 3 (recovered) = 30 is just the 27 you said is used up, but you have to figure out that the 27 you said already includes the money kept for the waiter.

3 people came out with a total of 27 yuan, the boss 25 yuan, the waiter 2 yuan, there is no more piece.

The waiter took 2 pieces, not 3 pieces Alas, the 1 piece was in 3 people.

I don't think you've heard the question wrong.

1.B produces 24 pcs per day.

2.Now the two of them play together, and the minutes are complete.

3.A and B work together to complete 7/12 of the total project in 2 hours

Question 1: Let A complete x parts per day and B complete y parts per day. Then:

x+y=60

4x+8y=380。。。Obtain y=35 Question 2: Let the article be in the unit "1", because "it takes 24 minutes for typist A to complete and 36 minutes for typist B to complete", so the speed of A is 1 12, and the speed of B is 1 24;Then the sum velocity of A and B is:

1/12+1/24=1/8；Therefore, the time required for two people to play together: 1 1 8 = 8 minutes.

Question 3: Let the project be the unit "1", because "A completes it in 8 hours alone, and B completes it in 6 hours alone", so the speed of A is 1 8 and the speed of B is 1 6, then the sum speed of A and B is:

1/8+1/6=7/24；7/12 of the time required to complete the entire project: (7 12) (7 24) = 2 hours.

1.（ 410）

2.（3.(1/1).

6.(24 and 48) (24).

7.No solution. 8.(cubic decimeters (cubic centimeters (80) milliliters (150) centimeters (tons (2040)cents.)

I'm dizzy, I have to ask such a question, it's okay to use my own brain!

The standard equation for a circle is: (x-a) +y-b) =r where (a,b)o is the center coordinate of the circle and r is the radius.

So: (1) Directly substitute the coordinates and radius of the center of the circle

x-4）²+y+1）²=1

2) Calculate the intersection of two lines and solve the system of equations

x+3y+7=0 3x-2y-12=0 has an intersection point of (2,-3).

The radius is then calculated from the distance from the intersection point to the center of the circle: r=5

Substituting the standard equation yields: (x+1) +y-1) =25

Proof: Connect the line segment OE and OP

ab is the diameter of the circle o.

o is the midpoint of the line segment AB.

CE=EBE is the midpoint of the line segment CB.

OE is the ABC median line.

boe=∠a ，∠apo=∠poe

oa=op∠a=∠opa

poe=∠boe

ob=op， oe=oe

ope≌⊿obe

b=∠ope=90º

ob pepe is the tangent of the circle o.

1 Cross multiplication (x-1)(x+2)=0 x=1 or -2

2 Formula method (x-3) 2=0 x=3

3 Discriminant =b 2-4ac=36-40 0 No solution.

1 Cross multiplication (x-1) (x+2)=0 x=1 or -22 Formula (x-3) 2=0 x=33 Discriminant =b 2-4ac=36-40 0 No solution.

Ah!!! There is no solution!!