Can anyone me with this problem and tell me how to solve it?
in a recent student government election, the ratio of students who voted for the to all the students who voted was 0.65. the number of students who voted was 80. how many votes did the winner get?

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?