Subject :IMO Class : Class 6
If 
then find the value of 
A
B
C
D
Ans 1:
Class : Class 6
Ans 2:
Class : Class 8
i cant understand the solution
Ans 3:
Class : Class 6
Ans 4:
Class : Class 7
i did not get it
Ans 5:
Class : Class 10
solution should be given . too messy
Ans 6:
Class : Class 8
i also did not get it
Ans 7:
Class : Class 7
Ans 8:
Class : Class 4
i do not understand the question and the solution both does not match
Ans 9:
Class : Class 7
i did not understand this question