Answer:
Part A, in order from top to bottom, left to right:
Drink Tea: Yes: 280
Drink Tea: No: 120
Drink Tea at least 3 cups a day: Yes: 80
Drink Tea at least 3 cups a day: No: 200
Part B: 1/5 of 400 people drink 3 cups each day.
Explanation:
Part A: No explanation needed, just filling in a table:
Part B: So the answer is 1/5. This is achieved by converting the percentage into a decimal, and in turn converting the decimal into a fraction.
If we are to convert 20% into a decimal, it becomes 0.20, and when we convert it into a fraction, it becomes 1/5.
Hope this helps.