Suppose Ruth Ann has 4 routes she can choose from to get from school to
the library, and 5 routes from the library to her home. How many routes
are there from Ruth Ann’s school to her home with a stop at the library?
This is a simple counting problem. There are 4 ways to go from her school to the library and 5 ways to go from the library to her home.
So, the total number of routes are 4x5 = 20 Choice B.
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