If 100 cats kill 100 mice in 100 days, then 4 cats would kill 4 mice in how many days ?

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Question: If 100 cats kill 100 mice in 100 days, then 4 cats would kill 4 mice in how many days ?
[A].

1 day

[B].

4 days

[C].

40 days

[D].

100 days

Answer: Option D

Explanation: