Average of two numbers is XY. If one number is equal to X, then other number is equal to?

• Let other number be A.
  Then (x+A)/2=xy
  Here we can write xy as (10x+y).
  So (x+A)/2 = (10x+y)
  (x+A) = 2(10x+y)
  A = 2(10x+y)-x
  A=19x+2y
• 9 years agoHelpfull: Yes(0) No(1)
• Let another number is M
  then
  (X+M)/2=XY
  X+M=2XY
  M=2XY-X
  M=X(Y-1)
  
• 8 years agoHelpfull: Yes(0) No(0)
• given one number is X,
  let another number is B
  then the average of two numbers is X+B/2=XY
  X+B=2XY
  B=2XY-X
  another number B=X(2Y-1)
• 7 years agoHelpfull: Yes(0) No(0)