[" LINEAR EQUATIONSINONEVARIABLE "],[" 9.Four years ago,my father's age was "4" times that of my age.At present the sum of my father's age and that of "],[" mine is "53" years.What are our present ages? "],[" 10.Neha's mother is four times as old as Neha.After "5" years,her mother will be three times as old as she will be "]