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?