Answer:
C
Step-by-step explanation:
[tex]450 \times \frac{2}{5} [/tex]
[tex]90 \times 2[/tex]
[tex] = 180[/tex]
180 was sold.
[tex]450 - 180[/tex]
[tex] = 270[/tex]
[tex]270 \times \frac{1}{3} [/tex]
[tex] = 90[/tex]
90 were given to the frontliners.
[tex]450 - (180 + 90)[/tex]
[tex]450 - 270[/tex]
[tex] = 180[/tex]
There are 180 remaining cookies.