[Question]Donna bought 3 times as many pencils as Marcia did. Marcia bought double the number of pencils as Cindi did. How many pencils did Donna and Marcia buy altogether if Cindi spent $30 on $0.50 pencils?
[Answer]Cindi bought 30 / 0.50 = 60 pencils. Marcia bought 2 * 60 = 120 pencils. Donna bought 3 * 120 = 360 pencils. Altogether, Donna and Marcia bought 120 + 360 = 480 pencils. The answer is 480.

[Question]Elizabeth has 10 reusable water bottles. She loses 2 water bottles at school. Then someone steals 1 of her water bottles at dance practice. To avoid any future theft of her water bottles, Elizabeth places 3 stickers on each of her remaining bottles. How many stickers does Elizabeth use in total on her water bottles?
[Answer]Elizabeth has 10 - 2 - 1 = 7 water bottles. Elizabeth uses 7 * 3 = 21 stickers. The answer is 21.

[Question]The library has 9,900 books. Over the summer, they sold some books. If only four sixths of the books are left, how many did they sell?
[Answer]A sixth of the books is 9900 / 6 = 1650 books. Only 4 * 1650 = 6600 books are left. The library sold 9900 - 6600 = 3300 books over the summer. The answer is 3300.

[Question]Violet has 3 more than twice as many nails as Tickletoe. If Violet has 27 nails, how many nails do they have together?
[Answer]
Violet has 27 - 3 = 24 nails, twice the number of nails that Tickletoe has. Therefore, Tickletoe has 1 / 2 * 24 = 12 nails. Together, Tickletoe and Violet have 12 + 27 = 39 nails. The answer is 39.