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There are 2 pots each filled with water and milk respectively. Some amount of milk is poured into water pot and then the some amount of mixture in water pot is poured into milk pot. which is true?

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PA and PB are tangent to the circle at A and B respectively and the chord BC is parallel to tangent PA.If AC=6 cm and lenght of tangent AP is 9 cm.Then what is the length of the chord BC.
What will be output if you will compile and execute the following ccode?
#define call(x,y) x##y
void main()
{
int x=5,y=10,xy=20;
printf("%d",xy+call(x,y));
}
(A) 35
(B) 510
(C) 15
(D) 40
(E) None of above