If (3a+6b) / (5a+12b) =12/23 then the value of 3a^2+5b^2/ab?

• 23(3a+6b)=12(5a+12b)
  
  => a= 2b/3
  
  3a^2+5b^2/ab
  
  {3(2b/3)^2+(5b)^2}/2b^2/3
  
  
  19/2
• 8 years agoHelpfull: Yes(16) No(0)
• 23(3a+6b)=12(5a+12b)
  => a=2b/3
  3a^2+5b^2/ab
  3[(2b)^2+(5b)^2]/2b^2
  87/2
• 8 years agoHelpfull: Yes(5) No(7)
• 23*3(a+2b)=12(5a+12b)
  23(a+2b)=4(5a+12b)
  3a=2b
  a/b=2/3
  Now,
  (3a^2+5b^2)/ab=3a/b+5b/a
  =(3*2/3)+(5*3/2)
  =19/2
• 6 years agoHelpfull: Yes(2) No(0)
• 3a+6b=12
  5a+12b=23
  a=1 b=1.5
  3^1^9.5^(2/5)
  9^12
• 8 years agoHelpfull: Yes(1) No(5)
• by simplifying the the given eq. we get a=6b/9.....put that in the next given equation....u will get 19/2 or 9.5 as final answer
• 8 years agoHelpfull: Yes(1) No(0)
• 23(3a+6b)=12(5a+12b)
  a=(2b)/3
  3a^2+5b^2/ab
  3(2b/3)^2+5b^2/(2b^2/3)
  87
• 8 years agoHelpfull: Yes(0) No(12)
• cross multiply (3a+6b)/(5a+12b)=12/23
  23(3a+6b)=12(5a+12b)
  69a+138b=60a+144b
  equate a and b
  therefore 69a-60a=144b-138b
  a/b=2/3
  sub a=2 and b=3 in 3a^2+5b^2/ab
  = 3(2)^2 + 5(3)^2/ 2*3
  = 3(4)+5(9)/ 6.
  = 12+ 45/ 6
  
  = 57/6
  the ans is 19/2 (3rd table) .
• 1 year agoHelpfull: Yes(0) No(0)