The average weight 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.
Options
A) 36kg B) 84kg C) 31kg D) 45kg E) 12kg
Sol. 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: 84kg
<result>B</result>
The average weight 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.