A jar contains 100 marbles. 3/5 of the marbles are black. What fraction of the marbles are black, using 100 as the denominator?

Question

Answer 1

To find the fraction of the marbles that are black, the numerator is the number of black marbles and the denominator is the total number of marbles. Since 3/5 of the marbles are black, the numerator is 3 and the denominator is 5. In terms of 100, we have $(3/5) \times 100/1 = 300/5 = \boxed{60/1}$.