Answer this question:A school has 100 students. Half of the students are girls, the other half are boys. 20% of the girls have dogs at home and 10% of the boys have dogs at home. How many students own dogs?
Out of 100 students, half are girls and half are boys so there are 100 / 2 = 50 girls. There are 50 girls out of 100 students means there are 100 - 50 = 50 boys. 20% of the 50 girls have dogs so they have .20 * 50 = 10 dogs. 10% of the 50 boys have dogs so they have .10 * 50 = 5 dogs. The girls have 10 dogs and the boys have 5 dogs so together, they have 10 + 5 = 15 dogs.
The answer is 15.

Answer this question:Thomas is 6 years old. His older sister, Shay, is 13 years older than him and 5 years younger than their older brother, James. How old will James be by the time Thomas reaches his current age?
Shay is 6 + 13 = 19 years old. James is 19 + 5 = 24 years old. Thomas will be 24 in 24 - 6 = 18 years. James will be 24 + 18 = 42 years old.
The answer is 42.

Answer this question:The height of the tree in Kilmer Park is 52 feet. Each year it grows 5 feet. In 8 years, what will the height of the tree be in inches, assuming 1 foot is 12 inches.
In 8 years, the tree will have grown 5 * 8 = 40 feet. In 8 years, the tree will be 52 + 40 = 92 feet. In 8 years, the tree will be 92 * 12 = 1104 inches.
The answer is 1104.

Answer this question:Tom decides to lease a car. He drives 50 miles on Monday, Wednesday, and Friday, and Sunday for the rest of the days he drives 100 miles. He has to pay $.1 per mile he drives. He also has to pay a weekly fee of $100. How much does he have to pay in a year.
He does the long drive 7 - 4 = 3 days a week. So he drives a total of 4 * 50 + 3 * 100 = 500 miles a week. That means the car cost 500 * .1 = $50 just for the mileage per week. So he pays 100 + 50 = $150 per week for the car. That means the total cost of the car is 150 * 52 = $7800 a year.
The answer is 7800.