At a certain time of day, a 40 foot building casts a 8 foot shadow. how tall is a person who casts a 2 foot shadow?

40 feet = 8 foot shadow

So in order to go from 40 to 8 you divide by 5.
 So if you have a person who casts a 2 foot shadow, you have to multiply by 5.

Your answer would be 10 feet.
Hope I helped :)

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)because it's going in order of the math sign