# HELP

A Question that I need help for

A cube has its vertex named A,B,C,D,E,F,G,H. All of them are real positive numbers. A near sum is the sum of all numbers of the vertexes that connects to the original vertex. The value of the near sums are (3,6,9,12,15,18,21,24). If the value of the near sum of A is 1, then what is the value of the near sum of F?

Note by Alfian Edgar
3 years, 7 months ago

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Just to clarify, is $$1$$ the near sum of $$A$$ or the value of $$A?$$ Because it seems that there are exactly 8 near sums you listed out, none of which are $$1.$$

- 3 years, 7 months ago

@Steven Yuan Probably a typo ("near sum of $$A$$ is 12/15/18"?).

@Alfian Edgar Notice that the near sums have complements which sum to 27, ie the near sum of a vertex is 27 minus the near sum of the opposite vertex; shouldn't be too hard to prove. Then, $$nearsum(F) = 27-nearsum(A)$$.

But if $$A = 1$$, then I don't know. My brain isn't working today.

- 3 years, 7 months ago

lol, then nearsum(F)= 27-3 = 24

- 3 years, 7 months ago

I'm sorry, what I meant was near sum of a=3, the original question was using the average of the near sums lol. It's my mistake.

- 3 years, 7 months ago

Then hopefully my reply to Steven will help you out a bit. Good luck and happy solving!

- 3 years, 7 months ago