A:B=7:5,B:C=3:4.IF C=30,What is A?

• A=31.5
  using equivalence
  A:B=7*3:5*3
  B:C=3*5:4*5
  NOW
  A:B:C=21:15:20
  LET A+B+C=X
  GIVEN C=30
  USING RATIO
  X*20/56=30
  X=84
  THE VALE OF A=
  84*21/56=>31.5
• 11 years agoHelpfull: Yes(0) No(0)