Violympic toán tiếng anh lớp 8 vòng 9

1) Given the point C on the segment AB such that the ratio of AC to CB is 3:7. Find the length of BC if the length of AB is 30 cm. Answer: The length of BC is 
 cm.
Lấy điểm C trên cạnh AB sao cho tỉ lệ giữa 2 cạnh AB và CB là 3:7 . Tìm độ dài cạnh BC biết cạnh AB có độ dài là 30cm.

2)How many numbers between 10 to 3000 are multiple 7? Answer: There are 
 numbers.
Có bao nhiêu số nằm giữa số 10 đến 3000 và có bội số chung là 7

3) Calculate: 366-363+360-357+354-351+…+300-297+294-291

4) Three children want to take a group photo sitting in a row. In how many ways can they arrange their sitting positions? Answer: There are 
 ways.
3 đứa trẻ muốn có một tấm ảnh nhóm ngồi thẳng hàng . Hỏi có bao nhiêu cách sắp xếp vị trí

5) The figure below is made of 2 squares of different sides (the length of sides are integer numbers).  Find the perimeter of the figure if its area is 
Answer: The perimeter of the figure is 
 cm.
Hình dưới được làm bằng 2 hình vuông của hai bên khác nhau (độ dài các cạnh là các số nguyên).
Tìm chu vi của hình nếu diện tích của nó là. 100 cm










Exam number 119:29
Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)
Question 1: Given the point C on the segment AB such that the ratio of AC to CB is 3:7. Find the length of BC if the length of AB is 30 cm. Answer: The length of BC is cm.
Question 2: Calculate: 366-363+360-357+354-351+…+300-297+294-291
Question 3: How many numbers between 10 to 3000 are multiple 7? Answer: There are numbers.
Question 4: Three children want to take a group photo sitting in a row. In how many ways can they arrange their sitting positions? Answer: There are ways.
Question 5: Subtract 100 from 7 times of a number A, the difference will be 68 more than 5 times the value of A. Find the value of A. Answer: The value of A is 
Question 6: The figure below is made of 2 squares of different sides (the length of sides are integer numbers).  Find the perimeter of the figure if its area is 
.
Answer: The perimeter of the figure is cm.
Question 7: Find the maximum value of the expression 
. Answer: The maximum value of B is 
Question 8: Given the triangle ABC, two bisectors BD and CE. Find the length of the side BC if 
 and the perimeter of ABC is 50 cm. Answer: BCcm.
Question 9: The perimeter of a rectangle is 34 cm. If its length is increasing 5 cm and its width is increasing 3 cm then the area is increasing 80 
. Find the original area of the rectangle. Answer: The original area of the rectangle is 
.
Question 10: Mark rides bicycle from his house to school with a speed of 15 km/h and arrives at the school 20 minutes late. However, if he rides with 20 km/h, he would reach the school only 5 minute late. Find the distance between his house and the school. Answer: The distance between his house and the school is km.