[Question]: There are 30 fish in the tank. One third of them are blue, and half of the blue fish have spots. How many fish in the tank are blue, spotted fish?
[Answer]: There are 30 / 3 = 10 blue fish. There are 10 / 2 = 5 blue spotted fish.
So the answer is 5.

[Question]: The United States flag has 50 stars, one for every state in the union, and 13 stripes, which represent the original 13 colonies. Pete, inspired by history, decided to make his own flag. He used circles, to represent how many scoops of ice cream he can consume in one sitting, and squares, to represent the number of brownies he has hidden beneath his bed. For circles, he used 3 less than half the number of stars on the US flag, and for squares, he used six more than twice the number of stripes on the US flag. What is the combined total number of circles and squares on Pete's flag?
[Answer]: Half the number of stars on the US flag is 50 / 2 = 25. Three less than half the number of stars on the US flag is 25 - 3 = 22 circles. Twice the number of stripes on the US flag is 13 * 2 = 26. Six more than twice the number of stripes on the US flag is 26 + 6 = 32 squares. In total, Pete's flag has 22 + 32 = 54 circles and squares.
So the answer is 54.

[Question]: Tony read 23 books, Dean read 12 books and Breanna read 17 books. Tony and Dean read 3 of the same books and all three had read the same book as well. In total how many different books have Tony, Dean, and Breanna read?
[Answer]:
Tony and Dean together read 23 + 12 = 35 books. 3 of these books were duplicates so Tony and Dean together read 35 - 3 = 32 unique books. All three read 32 + 17 = 49 books. Because the books are being counted three times, the book is counted 3 - 1 = 2 extra times. All together they have read 49 - 2 = 47 different books.
So the answer is 47.