Answer:
100 basketball cards
Step-by-step explanation:
Let the number of basketball cards = b
Let the number of football cards = f
In all, she has 120 cards:
![\implies b+f=120](https://img.qammunity.org/2023/formulas/mathematics/college/2tm6sgh54znlb17cyil38irwwe1qqg7csk.png)
She has five times as many basketball cards as football cards.
![b=5f](https://img.qammunity.org/2023/formulas/mathematics/college/as1ze85rwa1fyfqh3ij909iztz1hnkp9ay.png)
Substitute b=5f into the first equation:
![\begin{gathered} 5f+f=120 \\ 6f=120 \\ f=(120)/(6)=20 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/yxl059agiu5id49xhys4h7figho6mmknkb.png)
Therefore, the number of basketball cards will be:
![b=5f=5*20=100](https://img.qammunity.org/2023/formulas/mathematics/college/zfplom42q5hp7827uctkjc9lk3gbu1fo6q.png)
Allison has 100 basketball cards.