Oscar's age = 16
Sister's age = 12 
Current year: 16 / 12
Simplest form: 4 / 3 ; both are divisible by 4.
2 years after: (16 + 2) / (12 + 2) = 18 / 14 ; add two years to both numbers.
Simplest form: of 18 / 14 is 9 / 7; both are divisible by 2.
        
                    
             
        
        
        
Answer:
5x
Step-by-step explanation:
 
        
             
        
        
        
Answer: 270 minutes or 4 hours and 30 minutes
Step-by-step explanation: 3x6 =18  and 45 x 6= 270
 
        
             
        
        
        
I think the best option is 24.