Bob was creating a math test for an online platform. He created 13 questions in the first hour. Bob then doubled his rate for the second hour, and doubled his second hour rate for the third hour. How many questions did Bob create in the three hours? Give the rationale and then the answer.
Let's think step by step. First hour: 13. Second hour:13(2) = 26. Third hour: 26(2) = 52. Total:13 + 26 + 52 = 91 questions.. The answer is: 91.

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? Give the rationale and then the answer.
Let's think step by step. 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.. The answer is: 200.

Benny is baking pies for a bake sale. He plans to make ten pumpkin pies, which cost $3 each to make, and twelve cherry pies, which cost $5 each to make. If he wants to make a profit of $20 selling all the pies, how much does he have to charge for each pie if both kinds sell at the same price? Give the rationale and then the answer.
Let's think step by step. Benny will spend 3 * 10 = $30 to make the pumpkin pies. He will spend 5 * 12 = $60 to make the cherry pies. He wants to make a profit of $20, so he has to earn 30 + 60 + 20 = $110 selling all the pies. He is making 22 pies, so he needs to charge 110 / 22 = $5 per pie.. The answer is: 5.