It took Dad 5 more than twice as long to vacuum upstairs then to vacuum downstairs. He vacuumed for a total of 38 minutes. How many minutes did he vacuum upstairs? Give the rationale and then the answer.
Let's think step by step. Let D = time in minutes to vacuum downstairs. Upstairs = 2D + 5 minutes. 3D + 5 = 38. 3D = 33. D = 11 minutes. Upstairs = (2 * 11) + 5 = 27 minutes. Dad took 27 minutes to vacuum upstairs.. The answer is: 27.

Alton owns a business. He is currently renting a space that costs $20 per week. If Alton earns $8 per day, how much is his total profit every week? Give the rationale and then the answer.
Let's think step by step. Alton earns $8 x 7 = $56 per week. Therefore, his weekly profit after paying the rent is $56 - $20 = $36.. The answer is: 36.

Jacob's water tank can hold up to 50 liters of water. Jacob collects water from the river and rain to fill his water tank. He can collect 800 milliliters of water from the rain and 1700 milliliters of water from the river every day. How many days does Jacob need to fill up his water tank? Give the rationale and then the answer.
Let's think step by step. Jacob collects 800 + 1700 = 2500 milliliters of water from the river and rain every day. Since 1 liter is equal to 1000 milliliters, then 50 liters is equal to 50x1000 = 50,000 milliliters of water. Therefore Jacob needs 50,000 / 2500 = 20 days to fill his water tank.. The answer is: 20.