Ineed with this can someone plz mee

For a you will have to write a chart I think and write this 1 45
2 90 and so on b is 25×45=1125
and c is 445 minutes or 7 hours and 25 minutes

1. Unitary method
2. A typist takes 1 minute to type 45 words
So, he can type words in 25 minutes=
45 *25=1125
3.A typist types 45 words in 1 minute 
So, he can type 20025 words in minutes=
 20025/45 =445 minutes

50% of students voted for candidate b.