Q. The quantity y varies directly as xn . For x = 3, 4, 5 and 6, the corresponding values of y are 40.5, 96, 187.5 and 324. Find n:?
Option
A) 2
B) 2.5
C) 3
D) 3.5

• 10.5 13.5 16.5
  DIFF= 3
  Ans=3.
• 10 years agoHelpfull: Yes(5) No(0)
• Xn = Y
  
  3n = 40.5
  n= 13.5
  
  4n = 96
  n = 24
  
  5n = 187.5
  n=37.5
  
  6n=324
  n=54
  
  for first 2 value of n = 24 - 13.5 == 10.5
  for next 2 difference = 37.5 - 24 == 13.5
  for next 2 difference = 54 - 37.5 == 16.5
  
  The value difference between each is 3.
  
  so the value of n = 3
• 10 years agoHelpfull: Yes(4) No(0)
• shalu singh pls explain how to solve it
  
• 11 years agoHelpfull: Yes(3) No(2)
• ans:b 2.5
  its easy
  
• 11 years agoHelpfull: Yes(2) No(6)
• shalu please explain yrrr
• 11 years agoHelpfull: Yes(0) No(7)
• it should be x^n.... answer is 3 :P
• 10 years agoHelpfull: Yes(0) No(3)
• answer is 2 because in every step it increase 0.5
• 10 years agoHelpfull: Yes(0) No(2)
• please can anyone explain it neatly m not getting it :(
• 10 years agoHelpfull: Yes(0) No(0)