Give the step-by-step reasoning process and then the final answer. Nellie had 380 legos, but she lost 57 of them and gave her sister 24 legos. How many legos does she have now?

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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After losing 57 legos, Nellie has 380 - 57 = 323 legos. After giving her sister 24 legos Nellie has 323 - 24 = 299 legos.
The final answer: 299.