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In 1912, the U.S. government began issuing licenses to radio stations. Each station was given a unique three-letter "call sign." By international agreement, the U.S. eventually received rights to all call signs beginning with the letters W, N, and K. Radio stations in the western United States were given call signs starting with K. Stations in the east were given call signs starting with W (N was reserved for use by the U.S. Navy.) (a) How many three-letter call signs start with the letter W? Show your method. (b) How many three-letter call signs starting with W or K were available for U.S. radio stations? Show your work.
There are two equal groups of 8 books on the shelf. One group has reading books. In the other group three of the books are math books and the rest are science books. How many science books are there?
Given that there are 8 books in a group and one group have 3 math books, then we subtract 3 from 8 to find the number of science books:
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