[Question]: Bill started reading a book on the first day of April. He read 8 pages every day and by the 12th of April, he had covered two-thirds of the book. How many pages does the book have?
[Answer]: He read 8 pages every day for 12 days for a total of 8 * 12 = 96 pages. 96 pages is the same as two - thirds of the total number of pages which means: number of pages * (2 / 3) = 96. Therefore the total number of pages is 96 * (3 / 2) = 144 pages.
So the answer is 144.

[Question]: Annie was given a pack of crayons. The pack contained 21 crayons. She already had a box of 36 crayons in her locker. Her friend Bobby gave her half the amount she already had in her locker. She decided to give her sister Mary 1/3 of her total amount of crayons. How many crayons does she give to Mary?
[Answer]: Annie starts with 21 + 36 = 57 crayons. Bobby ends up giving her 36 / 2 = 18 crayons. Annie now has a total of 57 + 18 = 75 crayons. She ends up giving Mary a total of 75 * (1 / 3) = 25 crayons.
So the answer is 25.

[Question]: Tropical Storm Sally brings 3 days of rain to southern Texas. The first day it rained 4 inches. The second day it rained 5 times as much as the first day, and the third day it rained 6 inches less than the sum of the first two days. How much did it rain on the third day?
[Answer]:
First Day:4 inches. Second Day: 5(4) = 20 inches. Third Day: (4 + 20) - 6 = 18 inches.
So the answer is 18.