If A:B is 7:5 and B:C is 3:4 where C is 30 then find the value of A.

• A:B = 7:5 = 21:15 & B:C = 3:4 = 15:20
  Then A:B:C = 21:15:20
  Hence A:C = 21 : 20
  A = 21 * 30 / 20
  A = 31.5
  
  
  
• 10 years agoHelpfull: Yes(7) No(0)
• because A:B=7:5 let a=7x and b=5x
  and B:C=3:4 let b=3y and c=4y
  hence 4y=30
  => y=15/2
  hence b=45/2
  hence 5x=45/2
  i.e. x=9/2
  so A=7x=63/2 = 31.5
  
  
• 10 years agoHelpfull: Yes(1) No(0)
• A:B=7:5
  B:C=3:4
  So, A:C=21:20,
  C=30,
  so, A=21*1.5=(21+10.5)=31.5
• 10 years agoHelpfull: Yes(0) No(0)
• The value of A/C will be 21/20,and asC=30,so A=31.5
• 10 years agoHelpfull: Yes(0) No(0)