There are a total of five questions in a language competition the full score is not 100 points .

120 Ah Solution??! Hey, it's very simple, just think about it and move it.

True: x False: Y No: Z

x+y+z=25

4x-y=74

z-y=2 is obtained with x=19, y=2, z=4;

Answer: Chi Huai pointed to the correct 19 Ming drafts.

Set x questions correctly and make y mistakes.

4x-y=74

x+y+(y+2)=25

x=19, y=2

Answer: 19 correct, 2 wrong, no 4

Let the number of questions answered incorrectly be x, the number of questions that are not answered is y, and the number of questions answered correctly is z, x+y+z=25

x+2=y4z-x=74

So x=2 y=4 z=19

Suppose that all answers are correct, 7*20=140

B is wrong three times.

Assuming that you do the x question correctly, then the Shanheng stool question that you did wrong or did not do is the 20-x way, and according to the data given by the question, there is the following equation.

5x-2*(20-x)=65

Available: 5x+2x-40=65

7x=105

x=15 so get 15 questions right.

Using the hypothetical method, assuming that he is all right, should refer to the Ling score: 20 5 = 100 points.

He only scored 65 points, 100-65 = 35 points less.

One wrong question is less: 5 + 2 = 7 points.

35 points less, indicating that it is wrong: 35 7 = 5 questions Yanchang.

He got 20-5=15 questions right.

Assuming he gets all of them right, then he gets 100 points, and for each guess missing, he loses 7 points (-5-2) (2 points will be deducted for doing something wrong or not doing a trillion).

100-65) 7=5 He got 5 wrong questions in one number, and 15 of them were correct, and the equation was used to solve them.

Set the wrong question x.

20-x）*5+x*(-2)=65

35=7xx=5

Using the hypothetical method, assuming that she is all right, should be scored: 20 5 = 100 points.

She scored 65 points, 100-65 = 35 points less.

Wrong question is less than Bide: 5 + 2 = 7 distribution eggplant.

35 points less, the explanation is wrong: 35 7 = 5 questions.

She got 20-5=15 questions right.

Let's get the answer X right. 3x-（50-x）=

In the same way, 3x-(50-x) = x in the question is the number of regrets, so it does not meet the meaning of the question) Answer: You can't answer the old.

1. Set the correct answer to the question as x, and the wrong or incorrect answer to the question as (20-x) score y=10x-5(20-x)=15x-100 (0<=x<=20).

2 x=10,y=15*10-100=50 (points) Score: 503 y=80,=15x-100 x=12 The number of correct answers is 12

Solution:1 y=10x

2.y=10 10=100 (in the case that he did not fail to answer the question and answered the wrong question) 380 = 10x (in the case of no missing and wrong answers) x = 8

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If the correct answer is x, the wrong answer is y, then the non-answer is y+2

So x+y+y+2=25

4x-y=74 gives x=19 y=2

There are 4 questions that do not answer, 19 correct answers, and 2 wrong answers.

Li Gang: Uh, uh.

Solution: Suppose he answers correctly and wrong y, and does not answer 25-x-y-x-2y=-23

4x-y=47

Solution x=19

y=2 He answered 19 questions correctly.

Hope it helps.