11. A worker managed to make 160 spare parts in 4 hours. Based on the same calculation, how many parts can be made in 7 hours?
12. A number added by 5, multiplied by 6, and subtracted by 9, will have an answer of 27. What is that number?
13. There is a total of 220 chickens and ducks. The amount of chicken is 20 lesser than 3 times the number of ducks. How many chickens and how many ducks are there?
14. Number line:\(6,7,9,8,0,1,6,7,9,8,0,1,…\)
What is the \(126^{th}\) number?
15. 15. There are two classes for year three. If 7 students were transferred from the first class to the second class, the amount of students in the first class will be 3 less than the second class. Initially, how many students does the first class have more than the second class?
16. Mei Mei is 9 years old and mother is 37 years old this year. After how many years does the age of mother become three times the age of Mei Mei?
17. Find the sum of A and B:
18. A bundle of wire is cut into 5m segments. After cutting 6 times, the wire bundle is used up. What is the length of the wire bundle?
19. A quadrilateral has a perimeter of 42cm. The length is 2 times the width. What is the value of the length and the width?
20. 36 students are taking a mathematics exam. 21 students got the first question right while 18 students got the second question right. Every student got at least one question correct. How many students got both questions correct?
21. Class A has 42 students and class B has 35 students. After school reopens, 25 new students come in to register. How should the students be distributed so that both classes have the equal amount of students. (State the number of students added into class A and class B)
24. A, B, C, D are from China, Japan, America and France. It is known that:
I. A and the Chinese are doctors;
II. B and the French teach;
III. C and the Japanese have different jobs;
IV. D does not know how to treat a patient。
Which countries is each of them from?
25. It is known that 1\;m=100\;cm, Find the value of ( ? ):
\(3\;m+4.5\;m= ( ? ) ÷10\; cm\)