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Answer: 3736

Tuesday: 900 rats
Wednesday: 20% more than 900 = 900 + 90 + 90 = 1080 rats
Thursday: 30% fewer than 1080 = 1080 $-$ 108$\times$3 = 756 rats

Total: 1000 + 900 + 1080 + 756 = 3736 rats


This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.