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Surely, if you strength your logical skills, you can solve the problem as the tutor @greenestamps suggests.
But there is an Algebra way, where you don't need to strength - you need to follow the standard procedure, only.
The rate of work of each cat in catching mice is 3 mice divided by 3 cats and 3 minutes, which is
= of the mouse per cat per minute.
For another scenarious, the rate of work per cat per minute is the same
= ,
or
= . (1)
where x is the unknown number of cats.
From the proportion (1), you have, of course, x = 3 cats. ANSWER
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To see many other similar solved problems, look into the lesson
- Rate of work problems
in this site.
It is good to have both these methods at your possession.