Difficulty -
                                                                        Hard
                                                                    
                            
                                Total Plays - 148
                            
                        
                                Allowed Time - 15 sec
                            
                            
                                Best time - 0.897 sec
                            
                        A father is 36 years old and his son is 6. In how many years will the father be exactly three times as old as the son?
                        #A
                    
                    
                
                        #B
                    
                    
                
                        #C
                    
                    
                
                        #D
                    
                    
                Explanation: 
        In 9 years, father will be 45 and son will be 15. 45 is 3 times 15.
     
                                            