A number is four less than two times the other number. If their difference is 21, what is the greater number?

a) 50
b) 46
c) 31
d) 21
e) 15 ans:38

• A = one number
  B = other number
  A = -4 + 2B
  A - B = 21
  solve for A by adding B to each side
  A = B + 21
  Substitute (B + 21) for A in A = -4 + 2B
  (B + 21) = -4 + 2B
  add -B to each side
  21 = -4 + B
  add 4 to each side
  25 = B
  Since A = B + 21 , A = 25 + 21 , A = 46
  Answer b
• 8 years agoHelpfull: Yes(6) No(2)
• 46
  solve eq.
  x-y=21
  x=2y-4
• 8 years agoHelpfull: Yes(5) No(1)
• 46 is the correct answer ...
  
• 8 years agoHelpfull: Yes(0) No(1)
• X=2(Y-4)
  X=Y+21
  =>Y+21=2(Y-4)
  Y=29
  X=29+21=50
• 8 years agoHelpfull: Yes(0) No(1)
• one no.= x,
  other no.= 2x-4
  
  according to question.
  (2x-4)-x=21
  
  so ans is 46
• 8 years agoHelpfull: Yes(0) No(0)