The first six Prime Ministers of the country had an average tenure of 6 years. What is the tenure of the 7th Prime Minister if the average tenure of first nine Prime Ministers is 5.25 years and the duration of the tenure of the 7th, 8th, and 9th Prime Ministers are in the ratio 1:2:3?
[1] 1 year 3 months 18 days
[2] 1 year 10 months 15 days
[3] 2 years
[4] 1 year 6 months

• The total tenure of first six prime ministers is=6*6=36 years.
  The total tenure of nine prime ministers is=9*5.25=47.25 years.
  let the 7th,8th and 9th prime ministers had tenures of x,2x and 3x respectively(as their duration is 1:2:3)
  So we got this equation for this problem-
  36+x+2x+3x=47.25
  =>6x=11.25=>x=22.5 months=1 years 10 months 15 days
• 11 years agoHelpfull: Yes(5) No(0)
• 2] 1 year 10 months 15 days
  
  Total tenure of 6 PM =6*6=36 yrs
  total tenure of 9 PMs=9*5.25=47.25 yrs
  total tenure of 7th, 8th and 9th Pm = 47.25-36=11.25 yrs
  
  tenure of 7th PM = 11.25*1/6 yrs = 22.5 months= 1 year 10 months 15 days
• 11 years agoHelpfull: Yes(4) No(0)
• 2: 1YEAR 10 MON 15 DAYS
  x1+x2...+x6=6*6=36
  x1+x2+...+x9=9*5.25=47.25
  x7+x8+x9=11.25
  x7+2x7+3x7=11.25
  6x7=11.25*12 months
  x7=22.5 months
  =1 year 10 mon 15 days
• 11 years agoHelpfull: Yes(1) No(0)