2/10ths because if you add the marbles all together you would get 10 which would be your denominator and 2 would be your numerator because of how many black marbles
2/10 or 1/5 would be your answer. You get this answer by adding together the number of marbles to get a total of marbles, this will be the denominator, the number of black marbles is your numerator. Hope I helped :) If you have any other questions hmu!
