Q: A boat is traveling across a square lake at 10 MPH. It takes 2 hours to go across the length of the lake. It then travels the whole width of the lake at the same speed, which takes 30 minutes. How many square miles is the lake?
A: The lake is 20 miles across because 2 x 10 = 20. If takes .5 hours to go from bottom to top because 30 / 60 = .5. The lake is five miles from bottom to top because 10 x .5 = 5. The square mileage is 100 because 20 x 5 = 100. The answer is 100.
Question: James decides to bulk up. He weighs 120 kg and gains 20% of his body weight in muscle and 1 quarter that much in fat. How much does he weigh now?
Answer: He gains 120 * .2 = 24 kg in muscles. So he gains 24 / 4 = 6 kg of fat. That means he gains a total of 24 + 6 = 30 kg of bodyweight. So his new body weight is 120 + 30 = 150 kg. The answer is 150.
[Question]Ruby was going to order pizza for dinner. Her son would only eat pepperoni pizza. Her daughter would only eat sausage. Ruby and her husband wanted black olive and mushroom pizza. To make life easy, Ruby decided to order an entire pizza for each of her children and she would split one with her husband. The pizza restaurant charged $10.00 per pizza and $1.00 per topping. She also needed to add a $5.00 tip. Including tip, how much would the pizza order cost?
[Answer]Ruby was going to order 1 for her son, 1 for her daughter and 1 to share with her husband. So she needed to order 1 + 1 + 1 = 3 pizzas. Each pizza cost $10 and she was ordering 3 so that comes to 10 * 3 = $30.00. She needed to order pepperoni, sausage, black olive and mushroom, which came to 4 toppings at $1.00 each so 4 * 1 = $4.00 extra for toppings. The pizzas cost $30 and $4 for the toppings so the total costs of the pizzas came to 30 + 4 = $34.00. She also had to add a $5.00 tip to her current order total of $34.00 so 5 + 34.00 = $39.00 for the total order. The answer is 39.
Q: Sarah walked to school carrying a bag containing 25 apples. At school, she gave each teacher she saw an apple. She also gave a single apple to each of 5 of her closest friends. And while she walked home, she also ate one of the apples. If she had three apples left in the bag when she got home, how many apples had she given away to teachers?
A: Of her original 25 apples, Sarah gave five to friends, meaning she has no more than 25 - 5 = 20 apples available to give to teachers. She ate one while walking home, meaning she had no more than 20 - 1 = 19 apples available to give to teachers. And since she had three apples remaining when she got home, then the amount she had given to teachers was 19 - 3 = 16 apples. The answer is 16.
Question: In Grade 4, there are two sections -- Diligence and Industry. The two sections have an equal number of students after 2 students were transferred from section Industry to Diligence. How many students were there in section Diligence before the transfer if, in both sections combined, there are a total of 50 students?
Answer: There are 50 / 2 = 25 students in each section now. So, there were 25 - 2 = 23 students in section Diligence before 2 students were transferred in their section. The answer is 23.
Q: Adam went to a shop to buy some food for his journey. He bought 3 sandwiches, for $3 each, and a bottle of water for $2. How much did Adam pay for all the shopping?
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Adam bought 3 sandwiches, so he paid 3 * 3 = $9 for them. In total Adam bought products for 2 + 9 = $11. The answer is 11.