The number of birthday cards made is 72.
Ratio expresses the relationship between two numbers. It shows the frequency of the number of times that one value is contained in another number. The sign used to represent ratios is :
Total card = (sum of ratios x number of get well cards) / ratio of get well cards
(11 x 60) / 5 = 132
6/11 x 132 = 72 cards
To learn more about ratios, please check: https://brainly.com/question/25927869