Answer:
663
Step-by-step explanation:
the total number of students can be determined using this equation : 
(total ratio of Chinese and Indian students / total ratio of students) x n = 468
total ratio of Chinese and Indian students = 4 + 8 = 12
 total ratio of students 4 + 8 + 5 = 17
N = TOTAL NUMBER OF STUDENTS
12/17) x n = 468
multiply both sides of the equation by 17/12 
n = 663
 
        
             
        
        
        
A) x - 7 > 3    |add 7 to both sides
     x > 10
b) x - 7 > 3    |add 7 to both sides
     x > 10
        
             
        
        
        
x = 4
First you combine like terms:
8 + 4x = 24
Then solve:
4x = 24 - 8
4x = 16
x = 16/4 
x = 4
 
        
                    
             
        
        
        
Answer:
171,459 particles of CO
Step-by-step explanation:
331,002,651×0.000518 = 171459
 
        
             
        
        
        
Answer:
1 and 7/8 in two hours
Step-by-step explanation: