1. The number 36 represents 40% of a certain number. The whole number is ___.
2. A soccer team won 14 games, which is 70% of the total games they played. How many games did the team play in total?
3. A deposit of 21 dollars for a bicycle is 30% of its total cost. The total cost of the bicycle is ___ dollars.
4. If 45 is 15% of a number, what is the number?
5. A survey found that 120 people, or 80% of the total respondents, prefer dogs. The total number of people who responded to the survey is ___.
6. A company's stock value is now $72, which is 180% of its value a year ago. What was the stock's value a year ago, in dollars? ___
7. A charity team raised $540, which is 60% of their fundraising goal. What is their total fundraising goal in dollars?
8. A chemical mixture contains 22 grams of a rare element, which is 0.4% of the mixture's total mass. What is the total mass of the mixture in grams? ___
9. A water tank is 85% empty. If 90 liters of water are still in the tank, what is the total capacity of the tank in liters?
10. This year's festival attendance was 450 people. This represents 250% of last year's attendance. How many people attended the festival last year? ___