Rory is driving 584 miles to a family reunion. She will drive 300 miles by herself the first day. The second day, Rory and her cousin will share the driving equally. How many miles will her cousin dri

Rory is driving 584 miles to a family reunion. She will drive 300 miles by herself the first day. The second day, Rory and her cousin will share the driving equally. How many miles will her cousin drive? Write an equation to solve. Use a variable for the unknown.