Question: Emir wants to buy a dictionary that costs $5, a dinosaur book that costs $11, and a children's cookbook that costs $5. He has saved $19 from his allowance. How much more money does Emir need to buy all three books?
Answer: Step-by-step reasoning process: The total cost of the dictionary, the dinosaur book, and the cookbook is $5 + $11 + $5 = $21. Emir needs $21 − $19 = $2.
So the answer is 2.

Question: A snake's head is one-tenth its length. If a snake is 10 feet long, calculate the length of the rest of its body minus the head.
Answer: Step-by-step reasoning process: A snake's head is one - tenth its length, which is 1 / 10 * 10 = 1 foot. Since the snake's head is 1 foot, the rest of its body is 10 - 1 = 9 feet long.
So the answer is 9.

Question: Together Felipe and Emilio needed a combined time of 7.5 years to build their homes. Felipe finished in half the time of Emilio. How many months did it take Felipe to build his house?
Answer: Step-by-step reasoning process: Let F = the number of years Felipe needed to build his house. Emilio = 2F. 3F = 7.5 years. F = 2.5 years. 2.5 years = 30 months. It took Felipe 30 months to build his house.
So the answer is 30.

Question: Susie's pet lizard Moe takes 10 seconds to eat 40 pieces of cuttlebone each day. How long would it take Moe to eat 800 pieces?
Answer:
Step-by-step reasoning process: If it takes Moe 10 seconds to eat 40 cuttlebones, then in one second she eats 40 cuttlebones / 10 seconds = 4 cuttlebones / second. Since the cat eats 4 pieces of cuttlebone in 1 second, 800 pieces will be 800 cuttlebones / 4 cuttlebones / second = 200 seconds.
So the answer is 200.