The population of an area starts at 100,000 people. It increases by 60% over 10 years due to birth. In that same time, 2000 people leave per year from emigration and 2500 people come in per year from immigration. How many people are in the area at the end of 10 years? Give the rationale and then the answer.
Let's think step by step. The population increased by 100000 * .6 = 60,000 from births. They lost 2000 * 10 = 20,000 people from emigration. They gained 2500 * 10 = 25,000 people from immigration. That means the net increase from people moving was 25000 - 20000 = 5,000. So the total population is 100,000 + 60,000 + 5,000 = 165,000.. The answer is: 165000.

Mia can decorate 2 dozen Easter eggs per hour. Her little brother Billy can only decorate 10 eggs per hour. They need to decorate 170 eggs for the Easter egg hunt. If they work together, how long will it take them to decorate all the eggs? Give the rationale and then the answer.
Let's think step by step. Working together, they can decorate 24 + 10 = 34 eggs per hour. It will take them 170 / 34 = 5 hours to decorate all of the eggs.. The answer is: 5.

It takes 40 minutes to freeze ice cubes and 3 minutes per smoothie to turn them into smoothies once they're frozen. How long does it take to make 5 smoothies? Give the rationale and then the answer.
Let's think step by step. First find the total time spend making the smoothies: 5 smoothies * 3 minutes / smoothie = 15 minutes. Then add that amount of time to the time freezing the ice cubes to find the total time spent: 15 minutes + 40 minutes = 55 minutes.. The answer is: 55.