The average length of 6 bars is 80 cm. If the average length of one third of the barsis 70 cm, what is the average of the other bars?	Choose the correct choice from the following choices.
A) 75. B) 85. C) 90. D) 94. E) 100.
Edit:   Given ( X1 + X2 ... + X6 ) / 6 = 80   ( X1 + X2 ... + X6 ) = 480 --&gt; Eq 1.   Now given avg length of one third barsis 70. That means out  6 / 3= 
<gadget id="calculator"> 6 / 3</gadget>
<output>2</output>
2 bars.   let the avg length of two barsbe ( X1 + X2 ) / 2= 70 .   ( X1 + X2 ) = 140. --&gt; eq 2.   Now we are asked to find the average of the remaining i.e. ( X3 + X4 + X5 + X6 )   Substitute eq 2 in eq 1 then we get   140 + X3 + X4 + X5 + X6 = 480   =&gt; X3 + X4 + X5 + X6 = 340   Now divide 340 by 4 we get 85.   =&gt; ( X3 + X4 + X5 + X6) / 4 = 85 = avg length of remaining bars.   IMO correct option is 85..
<result>B</result>
The average length of 6 bars is 80 cm. If the average length of one third of the barsis 70 cm, what is the average of the other bars?