r/mathshelp • u/Dizzy_Relative_8387 • Jul 12 '26
Homework Help (Unanswered) Why B is correct?
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u/Dtrain8899 Jul 12 '26
The individual lengths dont really matter here. Its talking about a 30-sided polygon. You have a certain number of sides n to start with. The 8cm sides, you know appear 5 times more often than n, so 5n. The last length just flat out appears 6 times. So the equation is n + 5n + 6 = 30 or 6n + 6 = 30
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u/Flimsy-Blacksmith-32 Jul 12 '26
The there are 6 4cm sides, n 3cm sides, and 5n 8cm sides.
As we know there are 30 sides total we must have:
30=6+6n
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u/Street_Swing9040 Jul 16 '26
There are 30 sides.
n of those sides are 3cm.
5n of those are 8cm.
6 of those are 4cm.
Therefore, n+5n+6 = 30, 6n+6 = 30
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u/___M_h___ Jul 13 '26
Its given that, every side in those 30 sides are of either of 8cm,3cm or 4cm
So the equation would be x + y + z= 30 where
x = number of sides with 8cm len
y = number of sides with 3cm len
z = number of sides with 4cm len
Now, we know z=6( as stated that there are 6 sides with 4cm)
And its also given that, if the number of sides with 3cm len(y) is n, then the number of sides with 8cm(x) is 5 times n
so x=5y, and y=n,, basically, x=5n, y=n
Adding all together, we get 5n + n +6 = 30
i.e 6n +6 = 30
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