What is an equivalent ratio for 5:13

You can multiply the top and the bottom with the same number to get a equivalent ratio

or

Just multiply 5:13 by any number

10:26

15:39

20:52

25:65

etc ...

Find a number that both 5 and 13 go into, then take how many times 13 goes into that number and multiply 5 by that answer. The number you get is the answer (written a:b).

13x5 = 65 5x5=25 5:13 = 25:65 (order matters!)