In a probability experiment, Eric flipped a coin 30 times. The coin landed on heads 20 times. What is the ratio of heads to tails in this experiment?

The total number of flips is 30 and the number of heads is 20. Therefore, the number of tails is 30 - 20 = 10.

Therefore, the ratio of heads to tails in this experiment is 20:10, which simplifies to 2:1. This means that for every 2 heads, there is 1 tail.