Question: Peter has 15 birds. 1/3 are ducks. The rest are chickens and require special feed that costs $2 per bird. How much does it cost to feed the chickens?
Answer with step-by-step thinking: 2 / 3 of the birds are chickens because 1 - (1 / 3) = 2 / 3. He has 10 chickens because 15 x (2 / 3) = 10. It will cost $20 to feed them because 10 x 2 = 20.
So the answer is 20.

Question: Lance wants to finish reading a 100 page book in 3 days. Yesterday, he started to read 35 pages. Today, he read 5 fewer pages than yesterday. How many pages should he read tomorrow to finish the book?
Answer with step-by-step thinking: Lance read 35 - 5 = 30 pages today. So he read a total of 35 + 30 = 65 pages in 2 days. Thus, he should read 100 - 65 = 35 pages tomorrow.
So the answer is 35.

Question: Jame is trying to learn to tear playing cards. He can tear 30 cards at a time. A new deck of cards has 55 cards if you include the jokers and blank cards. He tears cards 3 times a week. If he buys 18 decks how many weeks can he go?
Answer with step-by-step thinking:
He tears 30 * 3 = 90 cards a week. He bought 55 * 18 = 990 cards. So he can tear for 990 / 90 = 11 weeks.
So the answer is 11.