In the month of july of a certain year,the average daily expenditure of an organisation was RS:68. For first 15 days of the month,the average daily expenditure was Rs:85 and for the last 17 days,Rs:51. Find the amount spent by the organisation on the 15th of the month.

• First 15 days: 85*15=1275
  First 14 days: 68*31-51*17=1241
  15th day=1275-1241=34
• 11 years agoHelpfull: Yes(51) No(2)
• x1+x2+.......+x31=2108
  x1+x2+.......+x15=1275
  x15+x16+......+x31=867
  x15=1275+867-2108=34ans
• 11 years agoHelpfull: Yes(13) No(2)
• x1+x2+.......+x15=85*15
  x15+x16+........+x31=51*17
  x1+x2+.............+x31=68*31
  88*15-x15+51*17-x15=68*31
  34=2x15
  x15=17
• 11 years agoHelpfull: Yes(8) No(13)
• Ans : 15*85+17*51-31*68 = 34
• 11 years agoHelpfull: Yes(0) No(0)