For Gwen's birthday she received 39 dollars from her mom. Her dad gave her 48 more dollars. If she spent 12 dollars. How much money did she still have?
Gwen's mom gave her 39 dollars. 
Gwen's dad gave her 48 more dollars. 
That means she had a total of 87 dollars. 
If she spent 12 dollars, she would have 75 dollars left.