Answer to 1st question :
Given ,
P(Independent) = 0.46 = r (say)
P(Liberal) = 0.30 = s
P(Conservative) = 0.24 = t
P(Vote | Independent) = 0.35 = u
P(Vote | Liberal) = 0.62 = v
P(Vote | Conservative) = 0.58 = w
So
P(Independent | Vote) = ru / ( ru + sv + tw )
= (0.46 * 0.35) / [(0.46 * 0.35) + (0.3 * 0.62) + (0.24 * 0.58)]
= 0.331
Hence the answer to the first question is 0.331
The second question has a bit lengthy calculation actually..