Give the step-by-step reasoning process and then the final answer. The epic poem currently contains 24 lines. If a person adds 3 lines to the poem every month, in how many months will the poem contain 90 lines?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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If the epic poem currently contains 24 lines, the total number of lines added for it to reach 90 is 90 - 24 = 66 lines. If a person adds 3 lines to the poem every month, it will take 66 / 3 = 22 months for the poem to contain 90 lines.
The final answer: 22.