If there are 20 people behind Jim and 30 people ahead of Beth, how many people in the line are between Beth and Jim?

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Jim and Beth are in a ticket line along with 43 other people, and Jim is ahead of Beth in the line.

If there are 20 people behind Jim and 30 people ahead of Beth, how many people in the line are between Beth and Jim?
A . 5
B . 7
C . 10
D . 13
E . 15

Answer: C