The average of weight of three 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 the average weight of B,C,D and E becomes 79 kg. The weight of A is :	Choose the correct option
A) 70 kg	B) 72 kg	C) 75 kg	D) 80 kg	E) none
Explanation:   A+B+75 kg = 3×84=252   A+B+75 kg+D= (4×80)=320   D = (320-252)= 
<gadget id="calculator">(320-252)</gadget>
<output>68</output>
68 and E= (68+3)= 
<gadget id="calculator">(68+3)</gadget>
<output>71</output>
71   Now, B+75 kg+D+E= (4×79)=316   B+75 kg+D=(316-71)= 
<gadget id="calculator">(316-71)</gadget>
<output>245</output>
245 kg   So, A= (320-245)= 
<gadget id="calculator">(320-245)</gadget>
<output>75</output>
75 kg   75 kgorrect Option: 75 kg
<result>C</result>
The average of weight of three 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 the average weight of B,C,D and E becomes 79 kg. The weight of A is :