The average weight of 3 men A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E, whose weight is 3 kg more than that of D, replaces A, then average weight of B, C, D and E becomes 79 kg. The weight of A is?  Choose the correct answer.
A) 70 kg B) 72 kg C) 75 kg D) 80 kg E) None of these
Weight of D = (80 x 4 - 84 x 3) kg = 68 kg   Weight of E = (68 + 3)= 
<gadget id="calculator">(68 + 3)</gadget>
<output>71</output>
71 kg   (B + C + D + E)’s weight= (79 x 4) kg = 316 kg   Therefore, (B + C)’s weight = [316 - (68 + 71)= 
<gadget id="calculator">316 - (68 + 71)</gadget>
<output>177</output>
177 kg.   Hence, A’s weight= [(84 x 3) - 177] kg = 75 kg.   ANSWER:75 kg
<result>C</result>
The average weight of 3 men A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E, whose weight is 3 kg more than that of D, replaces A, then average weight of B, C, D and E becomes 79 kg. The weight of A is?