Calculate the final charges on (i) the surface of the thin shell of radius 2a, (ii) the outer surface of the conducting shell (radius 3a), and (iii) the inner surface of the conducting shell (radius a).

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Make them both to where they have the denominator of 18that makes 3/2 equal 27/18 and 1/9 equal 2/18so now you have  27/18x+5=2/18subtract 5 from the other sideso now you have 27/18x+2/18-5then subtract 2/18 from 27/18 to get 25/18x=-5then divide 25/18 by -5 and your answer will be  -5/18

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