If a: b :: 3 : 7, then what is (5a+6b): (a-2b)?
Option
(a) 57:11
(b) -57:11
(c) 11 : 10
(d) -11 : 10

• b) -57:11
  
  (5a+6b): (a-2b)
  = (5a+6b)/(a-2b)
  divide Nr & Dr by b
  = 5(a/b)+6 / (a/b) - 2
  = (5*3/7 + 6) / (3/7 -2) [put a/b = 3/7]
  = -57/11
  
• 10 years agoHelpfull: Yes(4) No(0)
• (b) -57:11
  
  (5a+6b): (a-2b)
  = (5a+6b)/(a-2b)
  divide Nr & Dr by a
  = 5(a/b)+6 / (a/b) - 2
  = (5*3/7 + 6) / (3/7 -2) [put a/b = 3/7]
  = -57/11
• 10 years agoHelpfull: Yes(0) No(0)
• a/b = 3/7
  => a = 3b/7
  Put value of a in the expression given below:-
  5a + 6b / a - 2b
  = 5(3b/7) / (3b/7) - 2b
  = -57/11
  (b)
• 7 years agoHelpfull: Yes(0) No(0)