Please explain it with steps

3. For married couples living in a certain suburb, the probability that a husband will vote on a bond referendum is 0.45 , the probability that his wife will vote in the referendum is 0.55 , and the probability that both the husband and wife will vote is 0.30 . a. Find the probability that the husband will vote, given that his wife votes. b. Find the probability that the wife will vote, given that the husband does not vote