10 people get on an empty bus. At the next stop, 5 people get off and twice as many people get on as at the 1st stop. At the 3rd stop, 25 get off. How many people are on the bus?
                
                                    0
                                    10
                                    1
                                    25
                             
                         
	
                    
                        Mathematics
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                        A half is a third of it. What is it?
                    
                    
                 
                            
                    
                    
                        A farmer had 17 sheep. All but 9 died. How many live sheep were left?