The average weight of 3 packets A, B and C is 84 kg. Another packet D added into the group and the average now becomes 80 kg. If another packet E, whose weight is 3 kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 kg. The weight of A is: Choices
A) 70 kg  B) 72 kg  C) 75 kg  D) 80 kg  E) None of these
Explanation :   A+B+C = (84x3) = 252kg, A+B+C+D=(80x4) = 320kg.   D = (320 - 252)= 
<gadget id="calculator">(320 - 252)</gadget>
<output>68</output>
68 , E= (68+3) =7l.   B+C+D+E = (79x4)=316.   (A+B+C+D) -(B+C+D+E)=(320 - 316)= 
<gadget id="calculator">(320 - 316)</gadget>
<output>4</output>
4kg.   A - E= 4 = A = (4+E)=75kg   Answer : 75 kg
<result>C</result>
The average weight of 3 packets A, B and C is 84 kg. Another packet D added into the group and the average now becomes 80 kg. If another packet E, whose weight is 3 kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 kg. The weight of A is: