Q-1) A MAN 50 YEARS OLD HAS 8 SONS BORN OF EQUAL INTERVALS.THE SUM OF THE AGES OF THE FATHER AND SON IS 186.WHAT IS THE AGE OF THE ELDEST SON IF THE YOUNGEST SON IS 3 YEARS OLD.?

• sum of father and 8sons=186
  father age is =50
  8sons age are=136 come from(186-50)
  interval between the son is=d
  youngest son age is =3 years
  sum of 8sons ages are (3,3+d,3+2d,3+3d,3+4d,3+5d,3+6d,3+7d)=136
  24+28d=136
  28d=118
  d=4;
  so interval between the son is 4 years.
  eldest son age is a+7d=>3+7*4=31.
  Answer: eldest son is 31 years old.
  
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