Average of 5 numbers is 80. If three of these are 70 80 and 90. Find the average of the last two.

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1. a+b+c+d+e /5 = 80
   As we know three number are
   70+80+90+d+e /5 =80
   240+d+e/5 =80
   240+d+e = 80*5
   d+e = 400-240
   d+e = 160
   taking Average of 160 = 160/2 = 80

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