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One adult and 10 children are in an elevator. If the adult's weight is 4 times the average (arithmetic mean) weight of the children, then the adult's weight is what fraction of the total weight of the 11 people in the elevator?

Sagot :

thompzac
Ok so this means that the Adult weighs 4 times as much as the kids do because there is only one adult what we can do is add 4 to the total amount of kids in the elevator and subtract 1 from the adult amount, so now we have 14 kids in the elevator (however 4 of them are a adult) so that means that 4/14 is ratio of weight from adults to kids is and 4/14 can be reduced down to 2/7 Enjoy!=)
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