The average weight of A, B and C is 30 kg. If the average weight of A and B be 25 kg and that of B and C be 28 kg, then the weight of B is: Select:
A) 14 kg B) 15 kg C) 18 kg D) 19 kg E) 16 kg

Rationale: explanation let a , b , c represent their respective weights . then , we have : a + b + c = ( 30 x 3 ) = 90 â € ¦ . ( i ) a + b = ( 25 x 2 ) = 50 â € ¦ . ( ii ) b + c = ( 28 x 2 ) = 56 â € ¦ . ( iii ) adding ( ii ) and ( iii ) , we get : a + 2 b + c = 106 â € ¦ . ( iv ) subtracting ( i ) from ( iv ) , we get : b = 16 . b â € ™ s weight = 16 kg . answer e
Answer: E