24 girls prefer chocolate milkshakes out of 40 girls.
Ratio and proportions
From the given information, you can see that we have a total of 40 girls
If 3 out of every 5 prefer chocolate over vanilla milkshakes, hen;
3girls = every 5 prefer chocolate
x = 40 girls
Cross multiply
5x = 3 * 40
5x = 120
x = 24
Hence 24 girls prefer chocolate milkshakes
Learn more on ratio and proportions here: https://brainly.com/question/2914376
