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March 29, 2015

March 29, 2015

Posted by **Anna** on Tuesday, September 16, 2008 at 6:02pm.

- math -
**Reiny**, Tuesday, September 16, 2008 at 6:29pmFrom your first condition

12w+9r+8y+4b = 2w+1r+1b+1g

so 10w+8r+8y+3b-g = 0

from your last conditions, w is the smallest denomination and g is the largest, so that

r=Nw

y=N^2w

b=N^3w and

g = N^4w

putting those back in

10w + 8Nw + 8n^2w + 3N^3w - N^4w = 0

divide by w

10 + 8N + 8N^2 + 3N^3 - N^4 = 0

Hoping that N is a whole number, I only had to try N = 1,2, or 5 (factors of 10)

sure enough N=5 worked, so

smallest coin W

1 R = 5 W

1 Y = 25 W

1 B = 125 W and

1 G = 625 W

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