To find the total routes from school to home with a stop at the library, multiply the routes from school to the library by the routes from the library to home to get 15 routes.
The total number of routes from Ruth Ann's school to her home with a stop at the library can be found by multiplying the number of routes from school to the library (3 routes) and the number of routes from the library to home (5 routes). This results in a total of 15 routes.
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