Please answer i need it

This is so hard and it’s for a test

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.