400
Ms. B is setting up her monthly budget so that she can know how often she can go out to eat. Each month she earns about $2000. She usually spends $800 on utilities, rent, groceries, and gas, and she tries to save $900. If eating at a restaurant usually costs her $12, how many times could Ms. B go out to eat?
2000 = 800 + 900 + 12x
2000 = 1700 + 12x
300 = 12 x
25 = x
She could go out to eat 25 times.