it is equivalent to both because if you have 30:18 and divide both sides by 6 you will get 5:3 there for it is equivalent. for it not to be equivalent the to numbers both cant be divided by the same number and remain a whole number. also 30:18 can be divided by 3 because 30/3=10 and 18/3=6 therefor creating 10:6. overall, they are both equivalent to 30:18. hope it helps if its wrong let me know and ill try again :)
