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Math: I always can't tell who gets rid of who. For example, I bought 58 toothbrushes, a total of 95 yuan. How much is each toothbrush? Who gets rid of who.
Every (month, day, hour ...) these units with "every" are in the denominator position, and they are divided.
In other words, we have to put another unit without each in the numerator to be the dividend.
For example, a * * * 30 yuan took 10 days. How much is it per day? Is to use 30/ 10=3 yuan/day.