According to a survey of hikers on a trail, 50% of the hikers like Gatorade (G) and 40% like energy bars (E). 20% like both. Assume random selection:

1. Find the probability that a hiker likes Gatorade or energy bars
2. If a hiker likes Gatorade, find the probability that he likes energy bars
3. If a hiker likes energy bars, find the probability that he likes Gatorade.