For Gwen's birthday she received 2 dollars from her mom. Her dad gave her 4 more dollars. If she spent 3 dollars. How much money did she still have?
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Gwen's mom gave her 2 dollars. So she has 2 dollars. 

Gwen's dad gave her 4 more dollars. So she has 2 + 4 = 6 dollars. 

If she spent 3 dollars, she would have 2 + 4 - 3 = 3 dollars.