Clever comes in 5th grade math Olympiad questions

4. How many times is the speed of walking a bicycle per kilometer when walking per hour, and riding a bicycle is less than walking per kilometer?

Cycling costs less points per kilometer than walking, cycling kilometers uses fewer points, and the actual use of points is 1,000 kilometers per hour.

A: The speed of cycling is twice the speed of walking.

5. Two engineering teams A and B, the number of team A is twice that of team B, team A transfers 9 people, and team B transfers 18 people, team A admits defeat is the general of team B. How many people were in Team A?

After team A transferred 9 people and team B transferred 18 people, team A admitted defeat as the general of team B, indicating that A had 9 + 18 = 27 more people than B.

Since the number of team A is twice that of team B, 27 people is the original number of team B, then team A originally had 27 * 2 = 54 people.

A: Originally, there were 54 people in Team A.

6. If 1,500 tons of grain are stored in the east warehouse and 1,200 tons of grain are stored in the west warehouse, if 60 tons of grain are transported from the east warehouse to the west warehouse every day, how many days later will the grain in the west warehouse be twice as much as in the east warehouse?

The sum of grain in the east and west warehouses is 1500 + 1200 = 2700 tons.

Finally, the grain stock in the east warehouse is 2700 (2+1)=900 tons.

Grain shipped 1500-900 = 600 tons.

The number of days required is 600 60 = 10 days.

A: After 10 days, the grain in the west warehouse is twice as much as in the east warehouse.

The answer to the four questions is double.

Think of it this way, the walking speed is kilometers per hour.

Then the time spent on cycling kilometers is less than walking kilometers is minutes, then the time spent on cycling kilometers is 1 hour minus minutes is minutes, and the speed of cycling is.

Kilometers The speed of walking is 60 kilometers and 60 minutes.

The former is divided by the latter, which is the answer multiple.

The answer to the five questions was 24 people.

This is only done with equations.

If team A starts with x people, then team B is x 2 people.

Then Team A transferred 9 people and became X-9 people.

Team B transferred 18 players and became x 2+18

Later, Team B got the equation twice as much as Team A.

2(x-9)=x 2+18 gives x=24

The answer to the six questions is 10 days.

Think of it that way.

The west is twice the grain of the east, then the overall grain of 1200 + 1500 = 2700 tons is regarded as 3 parts, and the west accounts for 2 parts.

2700*2 3=1800 tons.

There is 1800-1200 = 600 tons of grain in the west warehouse, while there is only 60 tons of grain per day in the west warehouse, and it takes 600 60 = 10 days for this grain to come in.

1. Walking speed is kilometers per hour, about 80 meters minutes. It takes 1 km to walk. It takes a few minutes for a bicycle to walk a kilometer and a speed of 15 kilometers an hour.

2. The number of players in team A is 2x, and the number of players in team B is x. Column Equations:

2 (2x-9) = x+18, and x=12 is obtained, then team A has 24 players.

3. After X days, the grain storage in the west warehouse is twice that of the east warehouse.

2 (1500-60x) = 1200 + 60x, find x = 10 days.

Dizzy, I don't know how to do these problems except using equations.

1.As can be seen from the question, the number A is 10 times the number B, and the sum of the two numbers A and B is 11 times the number B.

A number 2Set up B bin x tons, A bin 2x tons.

2x-1200=3（x-900）

Solution: x=1500

1500*2=3000 (tons) - A warehouse.

3.If the remaining 5 pairs are also sold, then in addition to the cost, there is 81 yuan left for each pair of sandals, and the profit is yuan, a total of 81 pairs are sold).

This batch of sandals is a total of 90 pairs.

4.There are x four-wheeled vehicles and six-wheeled vehicles (78-x).

4x+6（78-x）=366

The solution is x=51 - four-wheeled vehicle, 78-51=27 (vehicle) - six-wheeled vehicle 5The delay of 2 hours means that 48 kilometers were lost, and then the additional 12 kilometers per hour can make up for 48 kilometers, which is 4 hours at a speed of 36 kilometers, a total of 144 kilometers (the distance between the accident site and B), and 144 kilometers from A.

Question 1: No; The second question: 3,000 tons for warehouse A, 15,000 tons for warehouse B; 90 pairs for the third question; Question 4: 51 four-wheeled vehicles and 27 six-wheeled vehicles; Question 5: 144 km.

1: and 2782: A 3900 tons.

B 1800 tons.

I guessed. The process will not.

Just like that, write 3: won't 4: won't 5: 288 24 = 12 hours 12-2 = 10 hours.

24 + 12 = 36 km.

288 36 = 8 hours.

12-8 = 4 hours.

4*36=144 km, the rest will not be scored.

。The sum and product of the single digit and the hundred digit are both 4, and both numbers must be 2; If the product of the multiplication of three numbers is still 4, then the ten digit is 1.

2. The ten-digit number obtained from the question can only be 4 or 5, and substituting 5 into it does not match the meaning of the title; Substituting 4 into the original two-digit number is 46.

3. The original number 857142

Let the original number be x300 + x = 7x + 24

Let the original number be xx = 3 * x-2) 10 + 200000].

64-4*3=52cm

The side length of a large square is (52*4) 4=14cm(14-4)*14 2=70

70+8=78cm

The shaded part has an area of 78 cm2

PS: If it is understood that 64 cm is the sum of the circumferences of two squares, it is 12 and 4, then the area at this time is 56. (It's so simple and it's definitely not an Olympiad), I don't know how so many 28s upstairs came about?

1 will not be the process, the answer should be 50

Length x, (199+x) 40=(172+x) 36Answer: 7140km s=

i.e. 50km s

5.A speed: 18-(180 15) = 6m s B speed: 180 8-18 =

Distance x(2x-150) (x+150)=130 (x-130)x=270 meters.