The average weight of A, B and C is 43 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:	Choose the correct choice
A) 17 kg	B) 20 kg	C) 26 kg	D) 31 kg	E) 25 kg
let d sum of a, b, c is 3*43= 
<gadget id="calculator">3*43</gadget>
<output>129</output>
129   and sum of a and b s 2*40= 
<gadget id="calculator">2*40</gadget>
<output>80</output>
80   sum of b and c is 3 *43=86   hence 80+86-129=25   ans=31   ANSW25 kgR:25 kg
<result>E</result>
The average weight of A, B and C is 43 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is: