Answer: 4 : 9
Explanation:
Total number of blue shirts purchased by Alice = 4
Total number of yellow shirts purchased by Alice = 5
Hence, total number of shirts purchase by her = 4 + 5
= 9
Therefore, Ratio of number of blue shirts to the total number of shirts
![=(Total~number~of~blue~shirts)/(Total~number~of~shirts)](https://img.qammunity.org/2023/formulas/mathematics/high-school/ac4z6pksze7bgxigz8dygo610nufh19czd.png)
![=(4)/(9)](https://img.qammunity.org/2023/formulas/mathematics/college/nrgt359s762t0xnuempff9yc044ws311p7.png)
Hence, Ratio = 4 : 9