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Posted on 4 April 2015
This marks our 150th Challenge! Go, Students!
And as always, you'll need knowledge of the past week to solve this.
There is a figure with the letters:
OAMOC FIQGU CPSIQ
and the word "MARTES".
Both the "MARTES" clue and the language it's in are key.
From Tyler Hinman: "Remember when I said it's always Vigenère? Yeah, it's not Vigenère."
Since "MARTES" is Tuesday in Spanish, you tranlate the answer to Tuesday's Math Challenge puzzle to the Spanish word "melocotonero". When using a Vigenère Cipher doesn't work, you try other ciphers such as a Subsitution Cipher. To decipher text encrypted with a Substitution Cipher using a keyword such as "melocotonero":
- Remove any duplicate letters from the keyword, resulting in "MELOCTNR".
- Remove those letters from the letters of the alphabet, resulting in "ABDFGHIJKPQSUVWXYZ".
- Concatenate the two parts from Step 1 and Step 2 to get the 26-letter Substituion Cipher key "MELOCTNRABDFGHIJKPQSUVWXYZ".
- Decode each letter of the cipher text by substitution the corresonding letter:
M E L O C T N R A B D F G H I J K P Q S U V W X Y Z ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Use that table to decode the Challenge cipher text:
O A M O C F I Q G U C P S I Q ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ D I A D E L O S M U E R T O S
The answer is stl.la/diadelosmuertos .
The video of Robyn's Excellent Adventure