If 5 cats can kill 5 rats in 5 minutes then how many rats can be killed by 30 cats in 30 minutes?
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If 5 cats can kill 5 rats in 5 minutes, then 30 cats can kill 30 rats in 5 minutes (1 cat per rat). If 30 rats are killed every 5 minutes, then 30×6=180 rats can be killed in 5×6=30 minutes