The average waight of A,B,C is 45 Kg. The avgwgt of A & B be 40Kg & that of B,C be 43Kg. Find the wgt of B.
Choose the most appropriate option.
A) 23kg  B) 16kg  C) 29kg  D) 31kg  E) 52kg
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.   Ans: 31kg
<result>D</result>
The average waight of A,B,C is 45 Kg. The avgwgt of A & B be 40Kg & that of B,C be 43Kg. Find the wgt of B.