Franklin has 5 red marbles, 16 black marbles, 3 green miniature marbles and 9 yellow marbles in a jar at his house. what is the ratio of the number of miniature balls to the number of black marbles in the jar?

3:16, this is the answer, or it should be.

So since the miniature balls were asked first, we know what number to start(3). Next, is the number of black marbles, which is our second number (16). So if you put them in order with the semi colon, the answer should be 3:16
*tip: when the problem says "to" that's a hint to a semi colon meaning ratios*