Answer:
$ [tex]\frac{2d}{3}[/tex]
Step-by-step explanation:
Amount of dollars required to buy 3 balls= $ d
As the cost of each ball is equal
Amount required to buy 1 ball= $[tex]\frac{d}{3}[/tex]
Amount that the had =$ d
She bought only one ball
Amount she left with= $ d-$[tex]\frac{d}{3}[/tex]
Amount she left with= $ [tex]\frac{2d}{3}[/tex]
Hence the correct answer is $ [tex]\frac{2d}{3}[/tex]