With 20 pirates and 1000 pieces of gold:

Captain Jack gets 113 gold coins (151 if you count the 38 everyone in the crew gets)
First Mate gets 66 gold coins (104 if you count the 38 coins everyone in the crew gets)
The Crew gets 38 gold coins each
The PBA gets 7 gold coins.

What are the percentages that Jack, First Mate, The Crew, and the PBA get?

In other words, what equation can I use to for splitting the gold evenly.

With the information given.

To calculate the percentages that Captain Jack, the First Mate, the Crew, and the PBA get, we need to determine the portion of the 1000 pieces of gold each of them receives and then express it as a percentage of the total.

Let's break it down step-by-step:

1. Captain Jack:
- Captain Jack gets 113 gold coins.
- To find the percentage, we divide 113 by 1000 and multiply by 100: (113/1000) * 100 = 11.3%.

2. First Mate:
- The First Mate receives 66 gold coins.
- Similarly, we divide 66 by 1000 and multiply by 100 to find the percentage: (66/1000) * 100 = 6.6%.

3. The Crew:
- Each member of the crew receives 38 gold coins.
- Since there are 20 pirates in the crew, the total amount the crew gets is 20 * 38 = 760 gold coins.
- To calculate the percentage for the crew, we divide 760 by 1000 and multiply by 100: (760/1000) * 100 = 76%.

4. The PBA:
- The PBA receives 7 gold coins.
- We divide 7 by 1000 and multiply by 100 to find the percentage: (7/1000) * 100 = 0.7%.

So the percentages that each group receives are as follows:
- Captain Jack: 11.3%
- First Mate: 6.6%
- The Crew: 76%
- The PBA: 0.7%