Final answer:
The ratio of the number of white roses to the total number of roses that Jessie bought is 7:18, which means that for every 18 roses, 7 of them are white.
Step-by-step explanation:
The content loaded describes a situation where Jessie bought 11 red roses and 7 white roses and we need to find the ratio of the number of white roses to the total number of roses. To calculate this, we first need to determine the total number of roses. Jessie bought a total of 11 + 7 = 18 roses. The ratio of white roses to the total number of roses is thus the number of white roses over the total number of roses. There are 7 white roses and 18 total roses, which gives us the ratio:7:18