Mitch scored 4 out of 5 on a quiz. Demetri scored 8 out of 10 on a quiz. Did Mitch and Demetri get equivalent scores?

Yes, 8/10 divided by 2 is equivalent to 4/5

Yes they're equivalent because 4 times 2 is 8, and 5 times 2 is 10. Since the top and bottom of the fractions are equal when multiplied by the same number (in this case 2) the scores are equivalent (proportional)