Two adjacent numbers are added together,

1+ 1=2

1+2=3

2+3=5

3+4=7

4+7= 1 1

See what the result is?

The result is a continuous prime number.

Then 7 plus the number in brackets should be the next prime number: 13.

Numbers in brackets: 13-7=6.

1、 1、2、3、4、7、( 6 ),

2.

? =53

Let's look at the number four in a small square.

The number in the lower right corner is equal to the sum of the other three numbers.

? =25+25+ 13=63

3.

A

A deck of red or black cards.

Open two pages, there are four situations: red, red and black, black and red, black and black.

Half of the same color is1/2; choose one

4.

Only 4- 1=3 people can pass at a time.

From 9: 00 sharp to 9: 00 17, a *** 17.

17÷5=3 more than 2

That is to say, by this time, it has been delivered three times, and the fourth time has not arrived yet.

Pass: 3×3=9 people

Plus four people on board, there are people waiting: 32-9-4= 19.

5.

The remaining total weight is 2+ 1=3 times that of bread.

8+9+ 16+20+22+27= 102

102 is divisible by 3.

Then a box sold should also be divisible by 3.

It could be 9 or 27.

If you sell 9, there is only one * * *: 102-9 = 93kg.

Leftover bread: 93÷3=3 1 kg.

The sum of one or more of the remaining 8, 16, 20, 22, 27 is not equal to 3 1, so it is not sold for 9 kg.

If you sell 27 kilograms, there is only one * * *: 102-27=75 kilograms.

Leftover bread: 75÷3=25 kg.

9+ 16=25, which fits the question.

So the bread sold is 27 kilograms.

1* * Bread purchased: 27+25 = 52kg.

6.

For the convenience of calculation, it can be assumed that there are 5 girls, and 5*( 1+80%)=9 boys.

The average score is 1 for boys and1+20% for girls =120%.

Total score: (5+9)×75= 1050.

Average score of boys:1050 ÷ (9 *1+5 *120%) = 70.

Average score of female students: 70×( 1+20%)=84.

7.

There is nothing to say.

According to the topic, you can get C.

PS: Friends in front, there is something wrong with the first question.

According to your law, 2+3=4?