The average waight of A,B,C is 45 Kg. The avg wgt of A & B be 40Kg & that of B,C be 43Kg. Find the wgt of B.	Choose the correct choice from the following answers.
A) 34Kg	B) 40Kg	C) 42Kg	D) 41Kg	E) 31Kg
Let A,B,c represent their individual wgts.   Then,   A+B+C=(45*3)= 
<gadget id="calculator">(45*3)</gadget>
<output>135</output>
135Kg   A+B=(40*2)= 
<gadget id="calculator">(40*2)</gadget>
<output>80</output>
80Kg &amp; B+C=(43*2)= 
<gadget id="calculator">(43*2)</gadget>
<output>86</output>
86Kg   B=(A+B)+(B+C)-(A+B+C)   =(80+86-135)= 
<gadget id="calculator">(80+86-135)</gadget>
<output>31</output>
31Kg.   Answer is 31Kg.
<result>E</result>
The average waight of A,B,C is 45 Kg. The avg wgt of A & B be 40Kg & that of B,C be 43Kg. Find the wgt of B.