Question: A special balloon increases by two-fifths of its previous volume every hour when placed under water. If its original volume is 500cm³, what will its volume be after 2 hours underwater?
Answer: Step-by-step reasoning process: In the first hour, the balloon will increase in volume by two - fifths of 500cm³ which is (2 / 5) * 500cm³ = 200cm³. After the first hour, it will have a volume of (500 + 200)cm³ = 700cm³. In the second hour, it will increase in volume by two - fifths of 700cm³ which is (2 / 5) * 700cm³ = 280cm³. After the second hour, it's volume will be (700 + 280)cm³ = 980cm³.
So the answer is 980.

Question: An aqua park charges $12 admission and $6 for a tour. A group of 10 people goes to the aquarium and takes the tour; while a group of 5 people only goes to the aquarium. How much does the aqua park earn?
Answer: Step-by-step reasoning process: A group of 10 people is charged $12 + $6 = $18 each. So, 10 people pay $18 x 10 = $180. A group of 5 people pays $12 x 5 = $60 for the admission. Thus, the aqua park earns a total of $180 + $60 = $240.
So the answer is 240.

Question: Jerry wakes up one morning and finds the thermostat set to 40 degrees. He set it to double the initial temperature. His dad notices, yells at Jerry, and reducing the temperature by 30 degrees. Later, Jerry's mother reduces the temperature by 30%, before his sister increases it by 24 degrees. What's the final temperature?
Answer: Step-by-step reasoning process: First double the initial temperature: 40 degrees * 2 = 80 degrees. Then reduce that amount by 30 to reflect the dad's change: 80 degrees - 30 degrees = 50 degrees. Then multiply that number by 30% to find how much Jerry's mother reduces the temperature: 50 degrees * .3 = 15 degrees. Now subtract 15 degrees from 50 degrees to find the temperature after the mother's change: 50 degrees - 15 degrees = 35 degrees. Finally, add 24 degrees to find the final temperature: 35 degrees + 24 degrees = 59 degrees.
So the answer is 59.

Question: Ellie has found an old bicycle in a field and thinks it just needs some oil to work well again. She needs 10ml of oil to fix each wheel and will need another 5ml of oil to fix the rest of the bike. How much oil does she need in total to fix the bike?
Answer:
Step-by-step reasoning process: Ellie needs 2 wheels * 10ml of oil per wheel = 20ml of oil. To fix the rest of the bike as well, she needs 20 + 5 = 25ml of oil.
So the answer is 25.