Question: There are 400 students. 120 students take dance as their elective. 200 students take art as their elective. The rest take music. What percentage of students take music?
Answer with step-by-step thinking: There are 400 - 120 - 200 = 80 students in music. Thus, students in music make up (80 / 400) * 100 = 20% of the students.
So the answer is 20.


Question: Gerald wants to buy a meat pie that costs 2 pfennigs. Gerald has 54 farthings, and there are 6 farthings to a pfennig. How many pfennigs will Gerald have left after buying the pie?
Answer with step-by-step thinking: First convert the number of farthings Gerald has to pfennigs by dividing by the exchange rate: 54 farthings / 6 farthings / pfennig = 9 pfennigs. Then subtract the cost of the meat pie to find how many pfennigs Gerald has left: 9 pfennigs - 2 pfennigs = 7 pfennigs.
So the answer is 7.


Question: Following her doctor’s recommendation to up her daily water intake, Nancy now drinks the equivalent of 60% of her body weight in water. If Nancy’s daily water intake is 54 pounds, how much, in pounds, does she weigh?
Answer with step-by-step thinking:
Let Nancy’s weight be x. We know that 60 / 100 * x = 54 pounds. This translates to x = 54 * 100 / 60 = 90 pounds.
So the answer is 90.