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Answer to Q190:
If three cats catch three rats in three minutes, how many cats will catch 100 rats in 100 minutes?
If three cats catch three rats in three minutes: then one cat will catch one rat in three minutes (not one minutes, three minutes).
So, to catch 100 rats:
= (1 cat/rat x 100 rats) every three minutes
= 1cat/rat x 100 rats x 3 minutes
= 300 cats minutes
So, 1 cats can finish the job in 300 minutes, but we were asked to calculate for 100 minutes.
But we have 100 minutes, so:
= 300 cat minutes ÷ 100 minutes
= 3 cats
Answer: 3 cats
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