Charge stored in the capacitors

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  The total charge stored in A and 2mf is Q_new = (C1 + 2) * 10 the totla charge stored in B is Q_new = C2 * 90 so (C1 + 2) * 10 = C2 * 90 C1 + 2 = 9C2 C1 + 2 = 9 * 1.5 C1 C1 = 0.16 mf Then C2 = 1.5C1 = 0.24 mf. answer is actually B.