Split the number 678 into three parts.
If the first part and the second part are in the ratio of 5:7; the second part and the third part are in the ratio of 3:11
then the value of the second part is .

NHật Minh ưi :3

Class A and Class B have the same number of students.

-The number of students in class A who took part in a mathematics competition is \(\frac{1}{3}\) of the studentsin Class B who did not take part.

-the number of students in class B who took part in a mathematics competition is \(\frac{1}{5}\)of the students in class A who đi not take part.

Find the ratio of the number of students in class A who did not take part in this competition to the number of students in class B who did not take part.

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 .
Calculate: .

Question 2:
Given two triangles  and .
If  and  then .

Question 3:
Suppose that  is directly proportional to  with the scaling factor is .
If  and  then k=.

Question 4:

In this figure, find the value of ?
Answer: .
(write your answer by decimal in simplest form)

Question 5:

Find the value of ?
Answer: .
(write your answer by decimal in simplest form)

Question 6:
Given two triangles  and .
If  and  then the perimeter of  is .

Question 7:

In this figure, .

Question 8:

The value of .
(write your answer by decimal in simplest form)

Question 9:
The perimeter of a triangle is  and the sides of its are in a ratio of .
Then the sides's length of the triangle are .
(write your answer from least to greatest and used ";")

Question 10:

Fill the suitable number in the "?".
Answer: .

giúp mik vs nha please