Primary School English Olympiad questions, please help answer the experts Thank you

If you continue with the numbers below, which line will 320 appear on? Where is it on that line?

The answer is written in the form of "line, position".

The answer is simple, count the 20th from left to right in line 25.

How is it calculated? Hehe.

When the first number in the nth row is 1+(1+(n-1))*n-1) 2n=25, the first number in the 25th row is 301, because there are n numbers in the nth row, so there are 25 numbers in this row, including 320, and 320 is the 20th number in this row.

Khan, 18 days.

There were 11 sunny mornings and 12 sunny afternoons, so there were 23 and a half days, that is, 11 days and 12 days.

There are a total of 13 rainy days, there are 13 half-days, there are 6 days and more than one day, and the two more than one sleepy day Wang Chaqing adds up to one day, a total of 11 + 6 + 1 = 18 days.

The same speed feels ambiguous.

If Zhang and Li run at the same speed x after meeting, then the last remaining should be (250-150)=100m

If Zhang and Li run at the same speed as the original after meeting, then the last remaining distance should be (250-150*150 250)=160m

Two people have the same speed, but the distance is not the same, it is only possible that Z ran 100m first, and then L ran like this, Z ran 250m, and L ran 150m

Apparently the circumference of the circle is 400m

Because the speed is the same, Z then ran 150m, and L also ran 150m, which is the length that Z ran before L, and L later ran the length before Z.

So L is still 100m away from the end.

Think of it this way, the table is enough, if you say that there is one more person who is familiar, then.

If there are 3 people at a table, it is exact.

If there are 5 people per table, it is exact.

If there are 7 people at a table, it is exact.

If there are 9 people per table, it is exact.

The above pattern can be seen at once.

The number of people derived from the above conditions is a common multiple of 3,5,7,9 minus 1The smallest is 314

There is another condition: if there are 11 people at a table, it is exact.

Then look for the common multiple of 314 and 11.

The minimum number is 3,454.

The number of tables is determined by 2 more people if there are 3 people per table.

The minimum number of tables is: 1151 tables.

This condition is the specific condition of asking for the table and the number of people.

Since it is an Olympiad problem, it should not be solved by binary equations. Let the velocity of a be x, which is equal according to the distance.

x+50)*6=(x-50)*26, and the solution is x=80

Jim and Lily depart from A and B, respectively; If they go in the same direction; Jim was able to catch up with Lily in 26 minutes; If Jim is departing from B and Lily is departing from A; They met six minutes later; Lily's speed is 50km min; Q: A and B are 80 km apart

780km, but their speed is too fast, they are all thousands of kilometers per hour.

Translation: A is a natural number less than 1000 in width of the ramp, and the loud A is divided by 18 to 33 and the remainder is the same (the remainder can be 0), how many such a A are there?

Answer:1First, find the common multiple of 18 and 33 [18,33] = 198 (use it to determine the number of cycles).

There are 1, 2, 3 in between....17,198 (remainder 0) These 18 numbers are divided by 18 and 33 to give the same remainder.

The remaining 9, so there is a total of 5*18+9=99A

a<1000, and a is a natural number. If A can be divided by 18 or 33, the remainder is equal to Wang (the remainder can be 0), find the number of eligible A.

1.A three-digit number, the sum of all digits is 16, and the size of the ten-digit number is equal to the sum of the single digit and the hundred. If the difference between the digits and the digits on the hundreds, the number obtained is 594 larger than the original number, and the original number is found.

Let the digits be x, y, z and then list the solution of the equation, first get the ten digits are 8, and then the number after the exchange is subtracted from the original number is 594, you can know that the difference between the single digit and the hundred digits is 5 + 1 = 6, and the final answer is 187

2.If a b = (3 b) then 2 + (2 a).

5) is 47

3.In a town affected by the flu, 20% of the people fell ill in the first month, 80% of the people were healthy, 20% of the sick people were cured in the second month, and 20% of the people who were originally healthy were infected.

4.There are 28 t-shirts in the drawer, 6 are red, 5 are blue, and the rest are white, and if Bob takes a random T from his luggage before vacation, he will have to take at least a few from the drawer to guarantee that he has three T's of the same color?

7 pcs. 5.A furniture factory produces all kinds of furniture, and it is known that each worker can produce 2 tables or 6 stools per day, with a total of 21 workers, and a set of furniture includes 1 table and 4 stools.

2x:6y=1:4, and x+y=21, 9 people produce tables, and 12 people produce stools.

6.The four babies Pat, Sean, Alan, and Sam are all holding birthday parties today, and in another year Sam will be the same age as Pat now, Alan's age is half of Sean's, and he is three years younger than Sam, Sam is 11 years old this year, and how old was Alan when Sam was 15 years old?

Alan is 3 years younger than Sam, so Sam is 15 years old and Alan is 12 years old.