###Human: John gave his fiancee a $4000 ring on their engagement day, a $2000 car as a gift on their wedding day, and a diamond brace twice as expensive as the ring he gave her during the engagement. What's the worth of the presents John gave to her fiancee?, ### Assistant: If John gave his fiancee a $4000 ring on their engagement day, a $2000 car as a gift on their wedding day, the total cost for the two presents is $4000+$2000=$6000.
He also gave his fiancee a diamond brace twice as expensive as the ring costing 2*$4000=$8000
The total worth of the presents John gave to his fiancee is $6000+$8000 =$14000 
 So the answer is :  14000