A group of 8 pupils, all of whom are known to have done Chinese homework or math homework. It is also known that there are 6 people who have finished their Chinese homework and 5 people who have finished their math homework. How many people have finished their Chinese and math homework?
Topic 2 grades
Chen Chen's mother rewarded her with some chocolates. Because her homework was excellent, she ate them all in two days. On the first day, she ate four chocolates. On the second day, she ate four fewer chocolate bars and seven fewer chocolate bars than on the first day. How much chocolate did she eat?
Topic 3 rd grade
Overseas Chinese Primary School donated money to Project Hope, 400 yuan for three years 1 Class 2, 450 yuan for three years/Class 2 and Class 3, and 4 1 Class 3/0 yuan for three years. How much do you donate for three classes?
Topic level 4
To celebrate the 60th anniversary of the founding of People's Republic of China (PRC), a parade of 60 floats * * * was reviewed, each of which was 4m long, with a distance of 6m between the front and rear cars, and the speed of the convoy was per minute100m. How many points does this train team need to pass through the 506-meter-long parade ground?
Title level 5
A pool is equipped with three water pipes. Tube A is the water inlet pipe, tube B is the water outlet pipe, which can fill the pool water in 20 minutes, and tube C is also the water outlet pipe, which can fill the pool water in 30 minutes. Now, first open the first pipe. When the water in the pool just overflows, it takes 18 minutes to open the second and third pipes. When the first pipe is filled with water, open the second pipe instead of the third one. How many minutes does it take to finish drinking water?
Topic level 6
At nine o'clock in the west, I began to do Olympic math problems. When he finished the problem, it was already 10. At this time, the hour hand and the minute hand just exchanged places with when he started to do the problem. Do you know how long it took me to do this problem?
Answer of this issue
1 grade
Answer and analysis:
People who have completed two kinds of homework are counted as 6 people who have completed Chinese homework and 5 people who have completed math homework, so these people are missed again, so the number of people who have completed two kinds of homework is: 6+5-8=3 (people).
Grade?Two
Answer and analysis:
Answer: I ate 4 chocolates the first morning and 9 chocolates the next day: 4*4-7=9.
Therefore, chenchen always eats chocolate: 4+9= 13.
Grade?Three
Answer and analysis:
1 class 180 yuan, class 2 220 yuan, class 3 230 yuan.
Donation for three classes: (400+450+4 10)? 2=630 yuan.
Category III: 630-400=230 (RMB)
1 class: 630-450= 180 (yuan)
Category II: 630-4 10=220 yuan (RMB)
Fully Good
Answer and analysis:
[4? 60+6? (60- 1)+506]? 100
=(240+354+506)? 100
= 1 100? 100
= 1 1 (points)
The distance traveled by the motorcade is equal to the sum of the length of the inspection site and the length of the motorcade.
Grade?Five
Answer and analysis:
1? (1/20+1/30) =12 indicates the number of minutes required for Party B and Party C to discharge the full pool of water.
112 * (18-12) =112 * 6 =12, that is to say, with the cooperation of Party B and Party C, the overflow pond
1/2? 18= 1/36 means that A enters the water once every minute.
Finally, 1? (1/20- 1/36)=45 minutes.
Grade?Six
Answer and analysis:
Answer: 60/(1+112) = 60 *12/13 = 55 and 5/ 13.
A: The score of this report is 55 5/ 13.
Analysis: This is a chance problem. You can understand it this way: the small square turned by the hour hand plus the small square turned by the minute hand is exactly equal to 1 revolution.
Minute hand 1 min, hour hand 1 min,112 min.
Total distance? Speed and sum are the answers!