Answer: She used half of a pound of flour.
Step-by-step explanation:
The amount of flour she bought to bake some cookies = [tex]\dfrac{3}{4}\text{ of a pound}[/tex]
Since, she used [tex]\dfrac{2}{3}[/tex] of the amount to bake her delicious chocolate chip cookies that means , the amount of flour she used would be
[tex]\dfrac{2}{3}\times\text{amount of flour she bought}\\\\=\dfrac{2}{3}\times\dfrac{3}{4}\text{ of a pound}\\\\=\dfrac{1}{2}\text{ of a pound.}[/tex]
Hence, she used half of a pound of flour.