Find the missing number, if a certain rule is followed in the figure.
  
 
A10
B11
C12
D13
PLEASE EXPLAIN THE REASON FOR THE ANSWER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Ans 1:
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Class : Class 6 
                                                                                                
                                                                                                Ans B.
Because every number in the left side of the circle is one more than the double of the number in top/bottom right of the number.
                                                                                            
                                                                                            Ans 2:
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Ans 3:
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                                                                                                     Karthika 
                                                                                                    from
                                                                                                    isg, Muscat
                                                                                                
                                                                                                Class : Class 7 
                                                                                                
                                                                                                ans A .Divide the circle into two halves vertically.on the right half add 2 to 3 and get 5 which is on the other half{bottom}.NEXT add 3 to 4 to get 7 which is on the other half.Again add 4 to 5 to get 9 which is on the left half.So therefore 5 + 5 is 10. now you'll go to the left half and 7-5 is 2 which is on the right half.
                                                                                            
                                                                                            Ans 4:
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Class : Class 6 
                                                                                                
                                                                                                Ans B.
Because every number in the left side of the circle is one more than the double of the number in top/bottom right of the number.
                                                                                            
                                                                                            Ans 5:
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Class : Class 5 
                                                                                                
                                                                                                Answer B 2+3=5 on opposite 3+4=7 on opposite similarly 5+6=11 is the answer in opposite.
                                                                                            
                                                                                             
             
             
        