The average of 8 readingsis 24.3 out of which the averae of first two is 18.5 and that of next three is 21.2. If the sixth reading is 3 less than seventh and 8 less than eighth, what is the sixth reading?
a)24.8
b)26.5
c)27.6
d)29.4
e)30.02

• ans.c)
  6th reading= x
  7th reading =x+3
  8th reading = x+8
  total sum of readings = 8*24.3
  sum of first two readings = 18.5*2
  for next three =3*21.2
  rest = x+(x+3)+(x+8)=3x+11
  8*24.3=2*18.5+3*21.2+3x+11
  x=27.6
  
• 11 years agoHelpfull: Yes(4) No(1)