Answer:
2 km
Step-by-step explanation:
basically do the inverse: 
3×4(instead of divide)=12
12-8=4
it says jose ran 2× as many km as karen so you divide 4 by 2 giving you 2
sorry if its incorrect
 
        
             
        
        
        
The answer is thirteen
1 cup=4 one fourths
3 cups=12 one fourths
Add one more one fourth
        
                    
             
        
        
        
Answer:
40 students
Step-by-step explanation:
In this problem, one is given the ratio ( 8 : 3 ), since a ratio is another way of writing a fraction one can rewrite it as; 
 (8) represent the number of students who want to learn about magnets, and (3) represents the number of students who want to learn about magic tricks.
In the problem, it is also given that 25 more students wanted to learn about magnets compared to magic tricks. If one uses the parameter (x) to represent the factor by which the fraction 
 is reduced, then one can get the equation;
8x = 3x + 25
Use inverse operations to solve,
8x = 3x + 25
-3x
5x = 25
/5 
x = 5
Substitute back in to find out how many students want to learn about magnets,
8x
= 8(5)
= 40
 
        
             
        
        
        
I believe the answer would b ( B) 1/3 
Hope this helps!