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| Adult fare 20 yuan/person |
| Child fare 10 yuan/person |
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During the National Day, the zoo sold 840 tickets at a price of 13600 yuan. How many adult tickets and children tickets did the zoo sell?
The problem of chickens and rabbits in the same cage:
All adult tickets: 20*840= 16800.
The overpaid amount is: 16800- 13600=3200.
The price difference is 20- 10= 10.
3200/ 10=320
840-320=520
520 tickets for adults and 320 tickets for children.
2. The monthly water fee of the suspect is not less than 15 yuan, and the water supply company charges as follows; If the monthly water consumption of each household does not exceed 5 cubic meters, it will be charged per cubic meter 1.8 yuan; The monthly water consumption of each household exceeds 5 cubic meters, exceeding the 2 yuan per cubic meter. What is the minimum monthly water consumption?
5* 1.8=9
15-9=6
6/2=3
5+3=8
Xiao Yi's monthly water consumption is at least 8 tons.
3. If every inner angle of a polygon is equal and the difference between each inner angle and each outer angle is 90, find the sum of the number of sides and inner angles of the polygon.
The sum of the inner angle and the outer angle is 180.
180 -90 =90
The sum of the interior angles of the polygon is (n-2) * 180.
(N-2)* 180 =N*90
90 N=360
N=4 (4-2)* 180 =360
The number of sides of this polygon is 4, and the sum of internal angles is 360.
4. The distance between Party A and Party B is 6 kilometers, and they start at the same time, moving in opposite directions, and meet at 1 hour; Starting in the same direction at the same time, A can catch up with B in 3 hours. What is the average speed of two people?
The speed sum of Party A and Party B is 6/ 1=6.
The speed difference between Party A and Party B is 6/3=2.
Speed of A: (6+2)/2=4
Speed of B: (6-2)/2=2
3X+2 2X- 1
5. When x divides those negative integers, the difference between the values of-and-shall not exceed 1?
5 3
(3X+2)/5-(2X- 1)/3≤ 1
Multiply both sides by 15:
9X+6- 10X+5≤ 15
1 1-X≤ 15
X≥-4
X can be-1, -2, -3, -4.