1.2, 5, 7, 1 1 are all prime numbers. If you multiply three of them and subtract the fourth number, there are * * * numbers.
2. Jia Cong, Xiao Ming and Li Jia spent the same money on several pencils of the same kind. Jia Cong and Xiaoming both got six more pencils than Li Jia, and each of them gave Li Jia 28 yuan. What's the price of each pencil?
Yuan.
There are 50 stamps from 3.3 yuan and 30 stamps from 5 yuan, which can form different postage rates.
Kindness
4. 10 Students' English test scores are ranked by scores. The average score of the top four students is 92 points, and the average score of the last six students is 8 points less than that of 10 students. The average score of this 10 student is
Points.
The ticket price of an amusement park is 60 yuan, and more than 100 people can buy each group ticket of 40 yuan. The ratio of the number of people in the two teams is 3:5. It costs more 1.440 yuan to buy tickets separately than together, so both teams have people.
6. A country's currency is special. There are coins from 4 yuan and 7 yuan. Some people have enough coins from 7 yuan. If he wants to buy goods from 80 yuan, 90 yuan, 100 yuan, 120 yuan, 180 yuan in different stores, he should at least prepare 4 yuan coins.
7. As shown in the figure on the right, two isosceles right triangles are stacked together, with AF length 3, AC length 12 and AGHID DE length 8. The area of the overlapping part (shaded part) is.
8. There are 7 pairs of white gloves, 8 pairs of black gloves and 9 pairs of red gloves in a bag. A child fumbled for gloves from his bag in the dark, one at a time, but he couldn't see the color clearly. In order to ensure that he can touch at least six gloves, he must touch at least one glove (gloves are divided into left and right hands, and any two gloves can be made into a pair).
9. There is a chess game with less than 20 people. Each player only plays against other players once. The winner gets 2 points, the loser gets 0 points, and the draw gets 1 point. It is known that there are at least three female players, and the male players are three times as many as the female players, but the total score of the male players is seven times that of the female players, so the female players can win a few games at most.
10. If there is a seven-digit number with the shape of 13xy45z divisible by 792, then the sum of the three numbers of x, y and z is.
1 1.
Happy New Year!
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