the weighted average of scores 35 and 55 is 40. how much is the ratio of weights attached to the scores?
A 3:1
B 2:1
C 4:1
D 3:2

• let wgt is n:m , (35n+55m)/(n+m)=40.
  35n+55m=40n+40m.
  15m=5n.
  3m=n => n/m=3:1.
• 9 years agoHelpfull: Yes(3) No(0)
• (35a+55b)/a+b =40
  a:b = 3:1
• 9 years agoHelpfull: Yes(0) No(0)
• LET NEW WEIGHT IS 'X'
  a/q,
  (35+55+X)/3=40
  x=30
  so ratio =30/120=4:1
• 9 years agoHelpfull: Yes(0) No(1)
• vikash will u please elaborate your answer ..it is wrong dudeeee
• 9 years agoHelpfull: Yes(0) No(0)