This morning, farmer Rita's workers collected 30,000 gallons of milk and chilled it in a storage tank. They then spent the next 4 hours pumping milk at a rate of 2,880 gallons/hour from the storage tank into a milk tanker. For the next 7 hours, the workers added more milk into the storage tank, at a rate of 1,500 gallons per hour. How many gallons of milk were left in the storage tank?
Let's think: In the first 4 hours, the milk tanker got 4 hours * 2880 gallons / hour = 11,520 gallons. Thus, the storage tank was left with 30,000 gallons - 11,520 gallons = 18,480 gallons. For the next 7 hrs, the workers added 1,500 gallons / hour * 7 hours = 10,500 gallons. The total therefore is 18,480 gallons + 10,500 gallons = 28,980 gallons.. The answer is: 28980.

Francine drives 140km to work each day. If she does not go to work 3 days every week, find the total distance she drives to work for 4 weeks in kilometers.
Let's think: There are 7 days in a week, so if he doesn't go to work for 3 days, he goes 7 - 3 = 4 days every week. He travels 140km each day for a weekly total of 140 * 4 = 560km. In 4 weeks he will travel a total of 4 * 560 = 2240km.. The answer is: 2240.

Marcus takes a deck of standard playing cards and takes out all the face cards and the 8's. Mark picks a card at random and then replaces it 36 times. How many times should he expect to pick a card that's both red and has a number divisible by 3?
Let's think: Without the face cards and the 8's, there are 9 cards of each suit. Half these cards are red, and 3 / 9 have numbers divisible by 3, so the odds of drawing a card divisible by 3 are 1 / 3. Multiply the odds of drawing a red card by the odds of drawing a card divisible by 3 to find the odds of both things happening: 1 / 3 * 1 / 2 = 1 / 6. Finally, multiplying the probability of drawing a red / 3 - divisible card by the number of cards Mark draws to find how many he should expect to meet his criteria: 1 / 6 * 36 cards = 6 cards.. The answer is: 6.

Ellie went to visit a circus with Sarah and they both got lost in the house of mirrors. They have to travel through the house of mirrors a few times before they finally get out and when they leave, they discuss how many times they've seen their own reflections. Sarah says that every time they were in the room with tall mirrors, she saw her reflection 10 times and every time they were in the room with wide mirrors, she saw her reflection 5 times. Ellie says that every time they were in the room with tall mirrors, she saw her reflection 6 times and every time they were in the room with wide mirrors she saw her reflection 3 times. They both passed through the room with tall mirrors 3 times each and they both passed through the room with wide mirrors 5 times each. In total, how many times did Sarah and Ellie see their reflections?
Let's think:
In the rooms with tall mirrors, Sarah saw her reflection a total of 10 reflections * 3 passes = 30 times. In the rooms with wide mirrors, Sarah saw her reflection a total of 5 reflections * 5 passes = 25 reflections. So Sarah saw her reflection a total of 30 + 25 = 55 times. In the rooms with tall mirrors, Ellie saw her reflection a total of 6 reflections * 3 passes = 18 times. In the rooms with wide mirrors, Ellie saw her reflection a total of 3 reflections * 5 passes = 15 times. So Ellie saw her reflection a total of 18 + 15 = 33 times. Therefore, Sarah and Ellie saw their reflections a total of 55 + 33 = 88 times.. The answer is: 88.