Dulce's father has eight orange trees on his farm. If each tree has 200 fruits and Dulce picks 2/5 of the oranges from each tree, calculate the total number of fruits remaining in all the trees.
Let's think: The total number of oranges in all the trees before Dulce picked any is 8 trees * 200 oranges / tree = 1600 oranges. If each orange tree has 200 oranges, and Dulce picks 2 / 5 of each tree's oranges, she picks 2 / 5 * 200 oranges = 80 oranges. Since the total number of orange trees is eight, Dulce picked 8 trees * 80 oranges / tree = 640 oranges from all the trees. After picking 640 oranges from the trees, the total number of oranges remaining became 1600 oranges - 640 oranges = 960 oranges.. The answer is: 960.

Cassandra collected 5000 pennies for the charity drive. James collected 276 fewer pennies. How many pennies did they donate to charity?
Let's think: James has 5000 - 276 = 4724 pennies. They donated a total of 5000 + 4724 = 9724 pennies.. The answer is: 9724.

Brody’s calculator can run for 60 hours on a full battery. Brody has used three quarters of its battery up, and he is about to take a two-hour math exam that will require his calculator the whole time. How many hours of battery will Brody’s calculator have left?
Let's think: Brody’s calculator has 60 * 1 / 4 = 60 / 4 = 15 hours of battery left. After his 2 - hour math exam, Brody’s calculator will have 15 - 2 = 13 hours of battery left.. The answer is: 13.

George is about to celebrate his 25th birthday. Since his 15th birthday, he's been given a special $1 bill from his parents. They told him that on his 25th birthday, for every bill he still has, they will give him $1.5 in exchange. He spent 20% of his special bills. How much will he receive from his parents when he exchanges them?
Let's think:
He received 10 special bills because 25 - 15 = 10. He has 80% of them left because 100 - 20 = 80. He has 8 left because 10 x .8 = 8. His parents will give her $12 for them because 8 x 1.5 = 12.. The answer is: 12.