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?
Thoughts? Step-by-step reasoning:
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.
Thus, the answer is 25.