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

No vote yet
1 vote

  Easy Math Editor

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold

- bulleted
- list

  • bulleted
  • list

1. numbered
2. list

  1. numbered
  2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.
2 \times 3 \( 2 \times 3 \)
2^{34} \( 2^{34} \)
a_{i-1} \( a_{i-1} \)
\frac{2}{3} \( \frac{2}{3} \)
\sqrt{2} \( \sqrt{2} \)
\sum_{i=1}^3 \( \sum_{i=1}^3 \)
\sin \theta \( \sin \theta \)
\boxed{123} \( \boxed{123} \)

Comments

Sort by:

Top Newest

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 \(1.\)

Steven Yuan - 3 years, 7 months ago

Log in to reply

@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.

Jake Lai - 3 years, 7 months ago

Log in to reply

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

Math Man - 3 years, 7 months ago

Log in to reply

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.

Alfian Edgar - 3 years, 7 months ago

Log in to reply

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

Jake Lai - 3 years, 7 months ago

Log in to reply

×

Problem Loading...

Note Loading...

Set Loading...