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| Question 1147211:  Sherlock made an elaborate code to remember the 10-digit combination to his locker.  This is the code he came up with:
 A - K - B - J - C - H - D - G - E - F
 Each letter stands for a different single digit number, from 0-9.
 To find the combination, study the clues below to figure out what digit is represented by each letter.  When two letters are written together without an operation symbol, they represent a tens digit and a ones digit.
 D + D + D = F
 H + H = B
 G + B +E = F + A +C
 J + A = CC
 F x D = KG (x means multiplied by)
 B / H = K (/ means divided by)
 D x H = CK
 A x H = KE
 J / D = K
 D      H (this is fractions, D over J and H over B)
 -   =  -
 J       B
 What is the 10 digit combination to Sherlock's locker?
 Found 2 solutions by  MathLover1, greenestamps:
 Answer by MathLover1(20850)
      (Show Source): 
You can put this solution on YOUR website! 
  , so   Then
  , so  
 Hence
  . We therefore also have a bunch of doubling pairs: 1-2, 2-4, 3-6, 4-8. But
  , so  and  are either 3-6 or 4-8. Note that
  &  are one set, and  &  are the other distinct set. Further,
  and  are a  pair. Note that
  , so  = 1,2,3. But from above,  =3,4, so  . Then
  and  . Further,  must be the other double pair available, 4-8. Hence  and  . Now,
  , so  . Since
  and  ,  so  and  . Further,
  . Then  =>  , so  . 
 solution:
  is   
Answer by greenestamps(13209)
      (Show Source): 
You can put this solution on YOUR website! 
 Given:
 1.  D + D + D = F
 2.  H + H = B
 3.  G + B +E = F + A +C
 4,  J + A = CC
 5.  F x D = KG
 6.  B / H = K
 7.  D x H = CK
 8.  A x H = KE
 9.  J / D = K
 10. D/J = H/B
 
 Analysis…
 
 From 4, C is 1
 
 From all the given information together, E and G are the only possible letters for 0.
 If G is 0, then 5 tells us either D or F is 5; but 1 tells us neither D nor F can be 5.
 So G is not 0; therefore E is 0.
 
 Since E is 0, 8 tells us either A or H is 5.
 But 10 tells us H can’t be 5.
 So A is 5.
 
 Then 4 tells us J is 6.
 
 Then, since J is 6, 9 tells us D and K are, in some order, 2 and 3.
 But D can’t be 2, because 1 would make F 6, but J is 6.
 So D is 3; and so K is 2.
 
 Then 1 tells us F is 9.
 
 Then 5 tells us G is 7.
 
 8 tells us H is 4.
 
 6 tells us B is 8.
 
 His code is
 
 A - K - B - J - C - H - D - G - E - F = 5286143709
 
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