The archivist misplaced his shopping list inside one of the books. He has a handy way to remember which volume he placed it in, though. The volume number was a four-digit number, in which all four digits were unique. If you take the largest possible four-digit number that can be made by rearranging the four digits, and you subtract from that the smallest possible four-digit number that can be made by rearranging the four digits, the number you get is volume number, but with the digits in reverse order.
In what volume of the Encyclopedia Altadoria did he leave his shopping list?
Answers:
it says that the largest possible number has to be derived from the actual number so it goes like this:
the largest number made from the digits is 7641
and the smallest is 1467.
so if you subract the smallest from the largest the answer is 6174
so the actual volume is 4716.
yipee! =]
I love neopets, but hate math story problems, this is my attempt
largest number would be 9876
smallest number would be 6789
9876 - 6789 = 3087
then flip it 7803
No! These are all wrong, I think. But I'm not telling my answer.
how about some clues
the largest unique number is 9876
the smallest unique number is ____ (odd,even,odd,even)
subtract and you get ____(all even unique numbers)
this in reverse is ____
i can't tell you, but i'll give you a hint to get started,
"in which all four digits were UNIQUE"
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