Ans 8:
Class : Class 10 
                                                                                                        
                                                                                                        The answer is A:0if you write the number sentence (given:(A-B)-(C-D)),each number will add and subtract itself(without the bracket):10923   18732 - 8473 - 18732 - 10923 - 9018   8473   9018from this we can say that the answer is 0.
                                                                                                    
                                                                                                    Ans 22:
Class : Class 7 
                                                                                                        
                                                                                                        See,deepak if 2-2 =0 ,then if the minued and the subtrahend are equal, the diff-erence is 0.