5+4+3+2+ 1= 15 (field)
2. "100 monks divided into100 steamed buns. There are three 1 big monks. The three young monks were divided into 1, which just ended. How many monks are there? "
Small: 100/(3+ 1)=25 (person) large: 25*3=75 (person)
3. Party A and Party B start from two places, which are100km apart, and walk in opposite directions. A took a dog and set out at the same time. The dog ran to B at the speed of 10 km per hour, turned around and ran to A immediately after meeting B, and ran to B immediately after meeting A again. In this way, the dog kept running back and forth between A and B until A and B met. If A walks 6 kilometers per hour and B walks 4 kilometers per hour, how many miles does the dog run?
100/(6+4)= 10 (hours) 10* 10= 100 (kilometers)
Children in kindergarten line up to ask their aunt for candy. The first child got three sweets, the second child got four sweets, the third child got five sweets ... and so on. The children in the back always get an extra piece of candy than the children in front, and finally the aunt eats up the candy. If these sweets are divided equally, each child can get 20 pieces. Excuse me, how many children got candy?
(20-3)*2=34 (person) 34+ 1=35 (person)
5.2000+ 1999- 1998- 1997+ 1996+ 1995- 1994- 1993+……+4+3-2- 1
=2000+( 1999- 1998)-( 1997+ 1996)………………+(3-2)- 1
=2000
6. Calculation:123456+234567+345678+456789+567901+679012+790123+90/kloc-0.
= __________.
123456+234567+345678+456789+56790 1+6790 12+790 123+90 1234
=( 123456+90 1234)+(234567+790 123)+(345678+6790 12)+(456789+56790 1) = 1024690+ 1024690+ 1024690+ 1024690
= 1024690×4
=4098760
7. The motorcade consisting of 52 cars inspected on National Day, each car is 4 meters long, every two adjacent cars are separated by 6 meters, and the motorcade runs every minute 105 meters. It takes () minutes for this train to pass through the 536-meter-long parade ground.
Because the distance traveled by the motorcade is equal to the sum of the length of the inspection site and the length of the motorcade.
So the required time is: [4× 52+6× (52-1)+536] ÷105 =10 (minutes).
8. Brother and younger brother * * * have 120 story books, and the number of story books of brother is three times that of younger brother. My brother has a story book (), and my brother has a story book ().
Take the number of books of my brother as 1, and the number of books of my brother is three times that of my brother, so the sum of the number of my brother and my brother is four times that of my brother. Then find out how many books there are, that is, the number of my brother's stories, and then find out the number of my brother's stories.
Brother has a story book = 120÷(3+ 1) = 30 (this);
My brother has a story book = 30×3 = 90 (this book).
9. The granaries A and B stored 320 tons of grain. Later, 40 tons were shipped from granary A and 20 tons were shipped to granary B. At this time, the grain storage of granary A is twice that of granary B, and the original grain storage of granary A and granary B is () tons and.
() tons.
Warehouse A and Warehouse B originally stored 320 tons of grain. "Later warehouse A shipped 40 tons and warehouse B shipped 20 tons." Warehouse A and warehouse B now have * * * grain (320-40+20)=300 tons. At this point, the grain stored in warehouse A is twice as much as that in warehouse B. You can first find out how many tons of grain are stored in warehouse B, and then subtract it.
Current grain storage in warehouse B = (320-40+20) ÷ (2+1) =100 (ton)
Grain stored in warehouse b = 100-20=80 (tons)
Original stored grain in warehouse A =320-80=240 (tons)
10. My father's age this year is three times that of Xiao Fang, five times that of Xiao Fang a few years ago and seven times that of Xiao Fang a few years ago. Their age difference is between 20 and 30, and my father is () years old this year.
This year, my father's age is three times that of Xiao Fang, indicating that the age difference is twice that of Xiao Fang, and it must be a multiple of two. Similarly, we can see that the father's age is five times that of Xiao Fang, and the age difference is four times that of Xiao Fang, which must be a multiple of four; Dad's age is seven times that of Xiao Fang, and the age difference is six times that of Xiao Fang. It must be a multiple of six. So the age difference should be a common multiple of 2, 4 and 6. According to the meaning of the question, the common multiple here should be 24, that is, their age difference is 24 years old, so the age of Xiao Fang this year is 24÷2= 12 (years old);
Dad's age this year is: 12+24=36.
1 1. There are many plums in the basket. If you give half of them to the first person, the remaining half and two to the second person, and then the remaining half and three to the third person, there is nothing left in the basket. There are () plums in the basket.
The last remaining half: 0+3 = 3 (pieces);
The rest of the second pass: 3 × 2 = 6 (pieces);
The remaining half of the first time: 6+2 = 8 (pieces);
The rest for the first time: 8 × 2 = 16 (pieces);
Half of the number in the basket: 16+ 1 = 17 (pieces);
Originally in the basket: 17 × 2 = 34 (pieces).
12. If a small square is given to small glass balls, the number of glass balls of the two is equal; If Xiao Ming gives Xiao Fang a glass ball, Xiao Fang has twice as many glass balls as Xiao Ming. How many glass balls do Xiaoming and Xiao Fang have?
Because Xiao Fang gave Xiao Amin balls, and the number of balls was equal, Xiao Fang had two more balls than Xiao Ming. And because Xiao Ming gave Xiao Fang a ball, Xiao Fang's ball was twice that of Xiao Ming. In the title, the numbers that satisfy both conditions are 5 goals from Xiao Ming and 7 goals from Xiao Fang.
13. The original plan is that there are 420 bricks for several students to carry, and each student carries the same number of bricks. In fact, one more student was added, so each student moved two bricks less than originally planned. Q: How many students are there?
Because the product of the number of people and the number of bricks moved by each person is 420, two groups of divisors suitable for the meaning of the question can be obtained from the divisor of 420.
420=2×2 10=3× 140=4× 105=5×84=6×70=7×60= 10×42= 12×35= 14×30= 15×28=20×2 1。
Generally speaking, 420= 14×30= 15×28 meets the problem. That is, the original 14 people, each with 30 bricks, increased 1 person, and each with 2 bricks less. 14 people
14. Two models of 17 boxes put 99 yuan, each large box 12 yuan, each small box 5 yuan, which is just enough. How many pieces are there in each big box and small box?
17×5=85 (granule) 99-85= 14 (granule) 14÷7=2 (big box) 17-2= 15 (small box)
15. There are five small football teams A, B, C, D and E participating in the football match. So far, Team A has played 4 games, Team B has played 3 games, Team C has played 2 games and Team D has played 1 game. So how many games did Team E play?
Team e played two games.
16. 1! = 1,2! =2* 1=2,3! = 3 * 2 * 1 = 6 ................Q 5！ =?
5! =5*4*3*2* 1= 120
17. Xiao Wang, Xiao Zhang and Xiao Li are together. One is a worker, the other is a farmer and the other is a soldier. They are all dressed in casual clothes. Now they know:
(1) Xiao Li is older than a soldier (2) Xiao Wang is different from a farmer.
This farmer is younger than Xiao Zhang
Guess, who is a worker, a farmer and a soldier?
From (2) and (3), we know that the farmer is Xiao Li.
You (1), (2) Know the Warrior: Xiao Wang.
The workers knew each other from two aspects: Xiao Zhang.
18 ... There is a wall clock that rings once an hour, how many times, six times, five seconds, 12 times, () seconds?
(6- 1)/5= 1 (seconds) (12-1)/1=1(seconds)
19. Eight black chopsticks, eight white chopsticks and eight yellow chopsticks are mixed together. I want to take out two pairs of chopsticks with different colors from these chopsticks. How many chopsticks should I take out at least to ensure that it meets the requirements? ( )
3+1+7+1=12 (root)
20. Party A and Party B compete to climb the stairs. Party A ran to the fourth floor and Party B happened to run to the third floor. According to this calculation, Party A ran to the 16th floor and Party B ran to the () floor?
(16-1)/(4-1) * (3-1) =10 (layer)
2 1. Frogs climb 3 meters during the day and skate 2 meters at night. It takes (8) days (7) nights for frogs to climb outside from the bottom of the well (the height of the well is10m).
10-3=7 (m) 7/(3-2)=7 (days)
22. Every floor of a building has to take 16 steps, and it takes 64 steps to get to Xiaoying's house. Where does his family live?
64/ 16+ 1=5 (architecture)
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