Frank is a manager of a doctor’s office. The office uses 20 sheets of paper three times a day for printing. How many sheets of paper will the office use in 21 days? (Show your work)

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.