the ratio of 5 3/5 to 2 1/10

18/5 divid by 21/10
18/5 x 10/21
6/1 X 2/7
12/7=12:7

could some one tell me if this is correct ?

yes.

the ratio of 5 3/5 to 2 1/10
Would you take a look at this? I think 5 3/5 = 28/5 and not 18/5.

how do you make a divide sighn on the computer?

To make a divide sign on the computer, you can use the forward slash ("/") symbol. This symbol represents division in most programming languages and mathematical notations.

For example, to write the division expression "18 divided by 5," you would write it as "18 / 5."