The average temperature of all 7 days of the week is 30, that of the first 3 days is 28 and of the next 3 days is 31. What is the temperature on the last day of the week?
A. 31
B. 30
C. 28
D. 33
E. 29

• Total 7 days average is 30 so Total Temperature is 7*30=210
  First 3 days average is 28 So First 3 days Temperature is 3*28=84
  Like Next 3 days is 3*31=93
  Last day Temperature is =Total temperature-(First 3 days+Next 3 Days)
  Last days is=210-(84+93) i.e 33
• 10 years agoHelpfull: Yes(1) No(0)
• last day=x, (28+31+x)/3=30, solving x=31
• 12 years agoHelpfull: Yes(0) No(2)
• Let the no. of days be a,b,c,d,e,f,g
  a+b+c+d+e+f+g/7=30
  a+b+c/3=28
  d+e+f/3=31
  now from above a+b+c=84
  and d+e+f=93
  therefore g=210-84-93
  g=33
  so ans is 33
• 10 years agoHelpfull: Yes(0) No(0)
• for 7 day=7*30=210
  for first three days=3*28=84
  for next three days=31*3=93
  total 6 days=84+93=177
  i.e, for last day temp=210-177=33
  ans
• 8 years agoHelpfull: Yes(0) No(0)
• In given question we have temperature of hole week i.e 7 * 30,as well as we have remaining days of information.we need to find out the temperature of the last Day.let assume it as LD
  7 * 30 = 3 * 28 + 3 * 31 + LD(Last Day)
  LD = 7*30 - 3 1* 28 - 3 * 31
  = 210 - 84 - 93
  = 33.
• 6 years agoHelpfull: Yes(0) No(0)
• We have 7 days in a week.
• 6 years agoHelpfull: Yes(0) No(0)