The 59 students in the class went to the park and rented 17 bicycles for 3 people and 4 people. The class was just full. How many bicycles for 3 people and 4 people?

The 59 students in the class went to the park and rented 17 bicycles for 3 people and 4 people. The class was just full. How many bicycles for 3 people and 4 people?

Let's rent x bicycles for 4 people, 4x + (17-x) × 3 = 59, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x + 51-3x = 59, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X + 51-51 = 59-51, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 8, 17-8 = 9, answer: 9 bicycles for 3 people and 8 bicycles for 4 people

A pot of water has 2250 ml, just full of 2 thermoses and 3 cups. The volume of the cup is 1 / 6 of that of the thermos. What's the volume of the thermos and the cup
milliliter?

2250 / (2 + 3 / 6) = 2250 / 2.5 = 900 ml
900 / 6 = 150 ml
Therefore, the volume of the thermos is 900 ml, and that of the cup is 150 ml

The 59 students in the class went to the park to rent 3-person and 4-person bicycles, which was just full. They rented 17 bicycles in total. How many bicycles did they rent for 3-person and 4-person

Set: rented x bicycles for 3 people and Y bicycles for 4 people
Then: A: x + y = 17
b:3X+4Y=59,
Take formula A to solve equation B: 3 * (17-y) + 4Y = 59,
We get: y = 8, x = 9
Answer: rented 3 person bicycle 9 Liang, rented 4 person bicycle 8 each

The whole class of 36 people went to "Xianjing Park" for a visit. The ticket notice at the gate of the park said, "each child ticket is 8 yuan, and 40 tickets can enjoy a 1 / 5 discount from the team."

36 people, if each person buys tickets according to children's ticket price, it will cost: 36 * 8 = 288 yuan
If you buy a group ticket, it costs: 40 * 8 * (1-1 / 5) = 40 * 8 * 4 / 5 = 256 yuan
So you can buy a group ticket for 40 people, 36 people and pay 256 yuan
It costs 288-256 yuan less than each person to buy children's tickets

All 36 students in the class go to Xianjing park. The ticket notice at the entrance of the park says: each student ticket is 8 yuan. At the beginning of 40 tickets, they can enjoy a one-fifth discount from the group. How do you calculate the cost? How much less can you pay?

It's cost-effective for groups. For 40 group tickets, the discount is 256 yuan, and for 36 retail tickets, it's 288 yuan. For group tickets, it's 32 yuan less than retail tickets, and there are four more tickets

The whole class of 36 people go to Xianjing park. The ticket notice at the gate of the park says that each person enters the park with a ticket. Each child ticket costs 8 yuan. At the beginning of 40 tickets, they can enjoy a one-fifth discount from the group?

The class of 36 people went to "Xianjing Park" to play. The "notes for buying tickets" at the gate of the park said: "each person enters with a ticket: each child ticket costs 8 yuan, and 40 tickets can enjoy a 5% discount from the group. How is the best way to buy tickets? How much less can you pay? Then: buy 40 tickets according to the group ticket, which needs 40 × 8 × (4 △ 5)

The class of 36 people went to "Xianjing Park". The "ticket notice" at the gate of the park said: "each person enters with a ticket: each student ticket is 8 yuan, 40 people and above can buy group tickets, and the group ticket price is four fifths of the student ticket price."?

The class of 36 people went to "Xianjing Park". The "notice for buying tickets" at the gate of the park said: "each person enters with a ticket: each child ticket costs 8 yuan, and 40 tickets can enjoy one-fifth of the group's discount at the beginning. How to buy the tickets? How much less can you pay?
If you buy 40 tickets by group ticket, you need 40 × 8 × (4 △ 5) = 256 yuan. If you buy tickets directly, you need 36 × 8 = 288 yuan. If you buy tickets by group ticket, you can pay 288-256 = 32 yuan less
LZ, the first floor answer is correct, but the text is a little simple

All 36 people in the class go to "Xianjing Park". The "notice to purchase tickets" at the gate of the park reads: "each person enters with a ticket: 8 yuan for each child ticket, and 15% discount for each group ticket (40 or more people)." how to buy tickets? How much less can I pay when I buy it?

The first way: 8 × 36 = 288 (yuan), the second way: 8 × 40 × (1-15) = 256 (yuan), the second way: 288-256 = 32 (yuan). A: the second way is the most cost-effective way to buy group tickets, which is to pay 32 yuan less when buying

There is a bicycle rental station in a park, and the rate is 2 yuan per hour (the part less than 1 hour is calculated as 1 hour)
There is a bicycle rental station in a park, and the rate is 2 yuan per hour (the part less than 1 hour is calculated as 1 hour)
Two people each rent a bicycle, if the probability of a and B returning the bicycle within one hour is respectively; the probability of returning the bicycle within one hour and no more than two hours is respectively; the rental time of both people will not exceed three hours
(I) find out the probability that Party A and Party B will pay the same rental fee;
(II) let the sum of the car rental fees paid by Party A and Party B be a random variable x, and the distribution sequence obtained is consistent with the mathematical expectation ex

There is no data
Let a and B return the car in less than one hour respectively, and C and D return the car in more than one hour and less than two hours respectively
The probabilities of two people renting a car for more than two hours but not more than three hours are (1-a-c), (1-b-d) respectively
1. The car rental fees paid by Party A and Party B are the same, including three kinds of events: no more than one hour for both of them, no more than two hours for both of them, no more than two hours for both of them, and no more than three hours for both of them
Therefore, the probability that Party A and Party B will pay the same rental fee = a * B + C * D + (1-a-c) * (1-b-d)
2.x=4、6、8、10、12
When X1 = 4
The incident was that both of them rented a car for less than an hour
p1=a*b
When x2 = 6,
There are two kinds of events: the time of car rental of Party A is less than 1 hour, that of Party B is more than 1 hour but less than 2 hours, that of Party A is more than 1 hour but less than 2 hours, and that of Party B is less than 1 hour
p2=a*d+c*b
When X3 = 8
The events include three kinds of events: Party A's car rental time is less than 1 hour, Party B's car rental time is more than 2 hours but less than 3 hours, Party A and Party B's car rental time is more than 1 hour but less than 2 hours, Party A's car rental time is more than 2 hours but less than 3 hours, and Party B's car rental time is less than 1 hour
p3=a*（1-b-d）+c*d+（1-b-d）*b
When X4 = 10
The incidents include that Party A's car rental time is more than 2 hours but not more than 3 hours, Party B's car rental time is more than 1 hour but not more than 2 hours, Party A's car rental time is more than 1 hour but not more than 2 hours, and Party B's car rental time is more than 2 hours but not more than 3 hours
p4=（1-a-c）*d+c*（1-b-d）
When X5 = 12
The incident involved both Party A and Party B renting a car for more than 2 hours but not more than 3 hours
p5=（1-a-c）*（1-b-d）
Expected value Ex = E1 * P1 + E2 * P2 + E3 * P3 + E4 * P4 + E5 * P5

About playing in the park

Today is Sunday.There are many people in the park.My friend and I go to the park.Some children in play football.We play basketball.We enjoy ourselves.But we're tired and thirsty.We had some ice cream.I like the park.
Today is Sunday. There are many people in the park. My friends and I go to the park. Some children are playing football. We play basketball. We have a good time. But we are tired and thirsty. We have some ice cream. I like this park
I wrote my own composition