. Given that A,B,C,D,E each represent one of the digits between 1 and 9 and that the following
multiplication holds:
A B C D E
X 4
--------------
E D C B A
-------------- what digit does E represent ?
a) 4
b) 6
c) 8
d) 7

• since there's only 5 digits at the answer, and A is the second number from E x 4, so A must be 2.
  
  since E x 4 = _ 2 and E is more or equal 8, so E must be 8.
  
  since B x 4 is less than 10, than B must be 1
  
  since D x 4 + 3 = _1, yhan D must be 7
  
  since C x 4 must be more than 30, C must be 6 or 9 (7&8 already been used). and with a little trial C = 9.
  
  A = 2
  B = 1
  C = 9
  D = 7
  E = 8.
  Prove = 21978 x 4 = 87912
  
  so the answer is c) 8
• 11 years agoHelpfull: Yes(7) No(4)
• c)8
  
  E represents 8.
  
  A B C D E *4 = E D C B A
  2 1 9 7 8 *4 = 8 7 9 1 2
  
  So, E = 8
• 12 years agoHelpfull: Yes(1) No(8)
• 4AE=1/4 (impossible)
  so A=2
  Hence E=4*2=8
• 12 years agoHelpfull: Yes(0) No(7)
• 4A
• 12 years agoHelpfull: Yes(0) No(7)