Answer:
 so that's how you plot their intersection
 
        
             
        
        
        
Answer:
28 questions
Step-by-step explanation:
In the first 10 mins she answered 2/5 of 40 which is 16. The remaining amount is 24 questions and half of that is 12. So she answered 12 questions in 15 mins. Finally you add them to get 28 questions in 25 minutes.
 
        
             
        
        
        
This is the equation. Try it for yourself and see if it works.
C= n x 4
        
                    
             
        
        
        
Answer : <span>10797060.8144
</span>2545.24 x 4242.06 = <span>10797060.7944
</span>10797060.7944 + 2/100 = 10797060.8144