= 42 and 
= 12, then the value of 
is ______.
A) 12
B) 33
C) 13
D) 18
Correct Answer: D
Solution :
We have,
= 12 and 
= 42 So, 
+ 12 + 12 =42 or 18 + 12 + 12 =42 Hence, = 18
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