(3a+6b)/(5a+12b)=12/23

find (3a+5b)/ab

• actually we have to find (3a^2+5b^2)/ab
  .
  .
  a= 1, b=3/2
  we get 19/2.... ans
• 10 years agoHelpfull: Yes(4) No(1)
• (3a+6b)/(5a+12b)=3(a+2b)/(5a+12b)=12/23
  (a+2b)/(5a+12b)=4/23
  after solution, a=(2/3)*b
  so, (3a+5b)/ab=(3* 2/3 *b +5b) / (2/3)b*b
  
  ans...21/2b
  
• 10 years agoHelpfull: Yes(3) No(0)
• 3a+6b=12 and 5a+12b=23. solving this equation a=1 and b=1.5,then put the value of a and b in given expression will got 7
  
• 9 years agoHelpfull: Yes(1) No(0)
• in paper it is 3a^2+5b^2 so
  3a^2/ab +5b^2/ab=3a/b+5b/a
  
  now from above given eqution divide in numerator and denominator by a OR b
  and find out the value of a/b OR b/a put in 2 equn.
  solve
• 10 years agoHelpfull: Yes(0) No(0)