One of the Bks should be Br... 
Let sevsn colors;
| R, |
| Bl, |
| P, |
| Bk, |
| Y, |
| Bk, |
| G, |
indicate decimal (十进制) numbers zero through six that are in random order; and a place-value system based on the decimal number 7 (7 进制).
| X |
| = |
|
| + |
| = |
|
( 6 | X |
| ) / ( | 4x |
| ) = |
|
| + |
| = |
|
|
What are these seven colors;
| R, |
| Bl, |
| P, |
| Bk, |
| Y, |
| Br, |
| G, |
equivalent to in decimal numbers?
green=0; yellow =1; red=2; brown=3; blue=4; black=5; pink=6 |
One of the Bks should be Br... |
  I'm glad you have the sunglasses; I don't want all the bright colors to hurt your eyes.  |
Before I read your post, I thought there would be an exception and I hadn't made any mistake. Obviously, this was not the case.   I marked one color black when I should have marked it brown. Thank you very much for pointing this out. |
顶多是个疯子，但是决不色盲。。。  （饶命啊。。。欧阳女侠。。。  ） |
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