Amazing Cryptogram #2

Eve is a loquacious chatterbox.

EVE DID = 0. TALKTALKTALKTALKTALK \frac{\overline{\text{EVE}}}{\overline{\text{DID}}}=0.\overline{\text{TALKTALKTALKTALKTALK} \cdots}

Two same characters indicate the same number, and two different characters indicate different numbers. Every character is an integer from 0 to 9, and E × D 0 \text{E}\times\text{D}\neq0 .

Given that the left side of the equation is an irreducible fraction, find the value of L+E+V+I+T+A+T+E+D . \text{L+E+V+I+T+A+T+E+D}.


This problem is a part of <Cryptarithms> series .


The answer is 42.

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1 solution

Boi (보이)
Jun 23, 2017

0. TALKTALKTALKTALK = TALK 9999 0.\text{TALKTALKTALKTALK}\cdots=\dfrac{\text{TALK}}{9999} .

Therefore DID = 101 , 303 , 909 \text{DID}=101,~303,~909 .


i ) DID = 101 i)~\text{DID}=101

99 × EVE = TALK 99\times\text{EVE}=\text{TALK} and since E 2 E\geq2 , the left side is impossible to be a four-digit number.


i i ) DID = 303 ii)~\text{DID}=303

33 × EVE = TALK 33\times\text{EVE}=\text{TALK} .

Since 33 × 414 = 13662 > 9999 33\times414=13662>9999 , E = 1 \text{E}=1 or E = 2 \text{E}=2 .

If E = 1 \text{E}=1 , K = 3 \text{K}=3 . But then D = K \text{D}=\text{K} , which doesn't satisfy the problem.

So E = 2 \text{E}=2 . Since DID \text{DID} and EVE \text{EVE} are coprime integers, there are 5 values for EVE \text{EVE} .

33 × 212 = 6 99 6 33 × 242 = 7986 33 × 2 6 2 = 8 6 4 6 33 × 2 7 2 = 89 7 6 33 × 292 = 9 6 3 6 33\times212=6{\color{#D61F06}{99}}6 \\ 33\times242=7986 \\ 33\times2{\color{#D61F06}{6}}2=8{\color{#D61F06}{6}}4{\color{#D61F06}{6}} \\ 33\times2{\color{#D61F06}{7}}2=89{\color{#D61F06}{7}}6 \\ 33\times292=9{\color{#D61F06}{6}}3{\color{#D61F06}{6}}

So we know that EVE = 242 \text{EVE}=242 and TALK = 7986 \text{TALK}=7986 .


i i i ) DID = 909 iii)~\text{DID}=909

11 × EVE = TALK 11\times\text{EVE}=\text{TALK} .

Since E = K \text{E}=\text{K} needs to be satisfied in order for the equation above to hold, it contradicts the problem.


Therefore, the original expression was 242 303 = 0.7986798679867986 \dfrac{242}{303}=0.7986798679867986\cdots .

L+E+V+I+T+A+T+E+D = 8 + 2 + 4 + 0 + 7 + 9 + 7 + 2 + 3 = 42 \therefore\text{L+E+V+I+T+A+T+E+D}=8+2+4+0+7+9+7+2+3=\boxed{42} .

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