Mathematics, 20.01.2021 19:00 crysderria

Carla and Rob left a 20% tip after having lunch at a restaurant. The amount of the tip was $6. Carla's lunch cost $15. Write an equation you can use to find x, the cost of Rob's lunch.

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Carla and Rob left a 20% tip after having lunch at a restaurant. The amount of the tip was $6. Carla...