Ans 5:
Class : Class 1 
                                                                                                        
                                                                                                        There were 4820 girls and 3926 boys in school hall. So 4820 3926=8746 we will now subtract 8746-1920=6820Ans=6820
                                                                                                    
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Ans 3:
Class : Class 7 
                                                                                                        
                                                                                                        Rayyaan, when there are mixed operations, always follow the DMAS method which means first Division, Second Multiplication, Third Addition and lastly Subtraction.