Line test math questions, line test math problems

It turned out that I was also worried that I couldn't find it, and I washed it. Ahh

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Male:Female ratio = (92-84):(96-92) = 2:1

That is, a man took 4 more cards than the average, a woman took 8 fewer cards than the average--- two men took exactly the same as a woman took less.

Finally I got it...

This question is 8 for female employees and 4 for male employees, so if you want to average 92, you must have more than the same as less, so it is 1:2

A gives half of his own to B, and A accounts for the total

It turns out that A accounts for 3 7 * 2 = 6 7 of the total

B accounts for 1-6 7 = 1 7 of the total

The ratio of A and B is 6 7:1 7 = 6:1 to choose C

Backwards... 4 (1-2 3) = 12 yuan.

12 (1-2 3) = 36 yuan. Pick D

Let the ages of the three people be a,aq,aq 2,a,q are positive integers.

a+aq+aq^2=77

If sum is odd, then a is odd, and a is the divisor of 77.

The approximate numbers of 77 are: 1, 7, 11, 77

1）a=11+q+q^2=77

q^2+q-76=0

There is no integer solution. 2）a=7

1+q+q^2=11

q^2+q-10=0

There is no whole comic grinding solution.

3）a=11

1+q+q^2=7

q^2+q-6=0

q-2)(q+3)=0

q=2 or q=-3 (rounded).

4）a=77

1+q+q^2=1

q=0 (not in line with the topic, discarded).

So a=11, q=2

The age of the middle member is: 11*2=22 years old. Choose C

A pass rate of 95 indicates that there is a failing grade.

The idea of this question is that if you want to score 10th, you need to have a high enough score in the top 9, and the person who fails also needs to be high enough. The score of 11 to 19 places should also be high enough, that is, only 1 point difference per person!!

So, the score of the top 9 should be:

The one who failed should be 59

Suppose the score of 10th place is n, and the score of 11th to 19th place is n-1, n-2, n-3...n-9

92+93+94+++100 +n+n-1+n-2+n-3+++n-9 +59=88*20=1760

96*9 + 10n-5*9 +59=176010n=882 n=points.

Since it can only be an integer, it can only be 89 points.

Friend, there are several ways to do this question, I'll give you 3 bells:

1. Total score = 88 * 20 = 1760

Number of passers = 20 * 95% = 19

Because the total score is certain, if you want to score the tenth person to take the lowest, the top 9 scores, the last place scores, the 11th --- 19th scores are as high as possible, the 1st --- 9th place scores are 100, 99, 98, 97, 96, 95, 94, 93, 92, sum = 96 * 9 = 864

The final place score is 59 points.

11th --- 19th 90, 89, 88, 87, 86, 85, 84, 83, 82, sum = 774

10th place = 1760-864-59-774=63

Obviously, if you can't rank 10th, then you need to subtract the score subsidy from the 11th ---19th place to the 10th place, so that it can exceed the 11th place, in order to keep the ranking unchanged, each person's score can not be the same, the 11th --- 19th place each give the 10th place 1 point, so that the 10th place is higher than the 11th place 3 times.

63 + 3 * 9 = 90 points, the 11th division has 87 points, so the 10th place can be evenly given 1 point to the 11th place.

10th place, 89 points.

Their scores are:

1st --- 9th 100,99,98,97,96,95,94,93,92

10th place, 89 points.

11th---20th 88th, 86th, 85th, 84th, 83rd, 82nd, 81st, 80th, 79th, 59th

2. To make the 10th the smallest, the scores of the 20th-11th and 9th-1 should be the highest possible.

Let the tenth be m and the failing grade is n

864+10m-45+n=1760

10m+n=941

When n is maximum, 51, m is minimum = 89

5%=1, the highest score for one person who fails is 59

Based on the average score of 88, the highest score from the first to the ninth place is each plus, a total of 72 points higher than the average score, then the remaining 11 people should have a total score of 72 points lower than the average score, minus a failed highest score of 29 to leave 43 points, easy to get 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45>43, so the lowest score for the tenth place is 89 points.

I hope it helps you, but you won't ask me

For the person in the 10th place to have the lowest score, the others need to score high. The first 9 are: 100, 99, 98, 97, 96, 95, 94, 93, 92.

The pass rate was 95%, with one out of 20 failing and his highest score being 59

So the total score of the remaining 10 people is: 20 88- 59 100 99+98 . 92﹚=837.

Then bring the options in and try them out. 837-90= ∴87+86+。。79=747

837-89=748， 88+86+85+84+。。79 = 748 b89 is the lowest score.

If it's 88,837-88=749, it's 89+86+85+. 79=749∴b

The passing rate is 95%, that is, 19 people pass, and those who fail assume that they have scored 59 points, and the highest scores of the first nine people are 100 points, 99 points, 98 points, 97 points, 96 points, 95 points, 94 points, 93 points, 92 points, and the average score is 88, that is, these 19 people have taken a total of 88 * 20-59 = 1701, so the sum of the scores of the tenth to the nineteenth people is 1701 (100 99 98 97 96 95 94 93 92) 837 points (because the question asks the minimum test score), assuming that the scores of these ten people are 91 to 82 points, then the sum of these ten scores is 865 points, which is 865 837 28 points more than the actual score. If 1 point is subtracted from the score of the 10th person, then 1 point is subtracted from the score of the remaining nine people in turn, so that 10 points are subtracted from their total score. It follows that the score of the tenth person can only be subtracted by 2 points to reach 89 points, so that the total score of the ten people may be 837 points.

If the tenth person has a score of 88 points, then the sum of the scores of these ten people is a maximum of 835 points. Therefore, the minimum score for the tenth person can only be 89.

88 20 = 1760 (min).

1760 2 20 = 176 (points).

176 2 = 88 (min).

88 + 1 = 89 (points).

In fact, this question does not correspond to reality, 176-59 = 117 (points) > 100 (points) does not match the question 100 points.

For example, if there are 12 people who can be qualified for one of the three positions of ABC, then there are 6 people who are not qualified for position A, that is, 6 out of 12 people can be qualified for any of the two types of BC, and from "the number of people who can only be qualified for position B is equal to 2 times the number of people who can only be qualified for position C", it can be seen that 4 out of 12 people can only be qualified for position B, and 2 people can only be qualified for position C.

Half of those who are only qualified for one position are not qualified for position A.

Meaning: For example, the number of people who can only be qualified for one position is x (including the number of people who can only be competent for A, the number of people who can only be qualified for B, and the number of people who can only be qualified for C) x=a+b+c where a=b+c=x 2

Didn't pass the first time:

The second time I didn't pass:

Then among the 60 people who failed the first time, 40 people did not pass the second time, so the number of people who failed the first time and passed the second time is 60-40=20

In the same way, the number of people who pass the first time and fail the second time is 80-40=40, so the number of people who pass both times is 320-40-20-40=220.

This title is a two-set repulsion principle. When there are only two conditions A and B in the question stem, and ab where both conditions are satisfied, the formula of the two-set repulsion principle is used to answer the question: A + B - Ab = Total - all conditions are not satisfied.

In the question stem, 260 people are A, 240 people are B, 40 people are not satisfied with all the conditions (only two conditions are not met), and the people who pass the two exams are AB (both conditions are met), and there are A, B, and AB, which belong to the two-set repulsion principle, and the answer is answered by formula; 260+240-ab=320-40, ab=220

If everyone is inconsistent, then there are 9 kinds, which are:

1 basketball and 1 volleyball.

1 football and 2 basketball.

2 volleyball, 2 football.

1 basketball and 1 volleyball.

1 basketball 1 football.

1 volleyball, 1 football.

With 100 9 = 11 and 1 remaining

Well, there are at least 11+1=12 people.

According to the conditions of this question, there are 3 ways to take only one ball, 6 ways to take only 2 balls, and there are only 9 ways to take it (permutation and combination principle), according to the most unfavorable principle, each way to take is average, and there are 11 to 12 people in each way, that is, at least 12 people have the same ball, so choose A.

Each person has a total of 6 ways to get the ball, 1 foot 1 basket 1 row, foot volleyball, foot basket, volleyball basket, this is a total of 9 balls, 100 9 = 11 more than 1, so at least 12 people are the same.

Pick B. If you draw the picture, you can immediately know that when we first met, A traveled 60 km and B traveled 40 km.

60/40=(v+2)/(v-2), v=10

Oh, I want to solve math problems in elementary school :)

Completed A, B, C three teams A and B two tasks, than B? What is the amount of the first phase of the project? More than 1 4, and let B and C team alone a project completion time takes 20, 24, 30 days for a project team, let B project A, B team, in order to complete these two projects at the same time, C team, B team cooperation, and then in a team cooperation, ask C team B how many days?

2。Car B goes from A to B to C. Both a and b are equal to the distance between b and c.

The speed of car B is 80 speed, the armored vehicle, car B departs 11 minutes earlier than car A, but stays in car B for 7 minutes, a car stops on the ground of car C than car B, and the last armored vehicle is 4 minutes earlier on the land of C. Well, how many minutes later will the B car, the B car of the armored vehicle?

Hard, the twists and turns calculated in the end, B B point A is at B 27.

located at a speed described.

With y y full point out.

xy = 80 x (11 + y-7 +4) = 32, 40 points of the whole course of "ab = bc, where a to b points, 16 points, b b 20 points.

Let b start z minutes by one more than b

z-11）* 1/32 = z * 1/40-7/40

z = 27, greater than or equal to 27, above Chengcheng Li. Outcome.

Correct March 21 this year at 12:03 minutes, 25 seconds slower per hour indication correct Q: What number of days in the next month indicates the correct time point?

12 * 60 * 60 25 24 = 72 days later, May 31 at 12:00 p.m.

4。Table, 30 seconds per hour faster than the alarm clock, alarm clock per hour than the standard time, ** a few seconds of the standard time of the day and night difference is 30 seconds slower?

Bad? It doesn't seem bad. Consistent with standard time.