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in this video were going to focus on solving age-related word problems like the one you see on the board so sally is three times as old as john eight years from now sally will be twice as old as john how old is john so theres two things you need to be concerned with the present and the future so im gonna put sally and john so sallys present age well call it s johns present age well call it j in the future that is eight years from now sally her age will be s plus eight shes gonna be eight years older and johns age will be j plus 8. so now we need to write an equation for the present and the future so at the present sally is three times as old as john so that means s is equal to 3j now eight years from now that is the future sally will be twice as old as sean so s plus eight thats sallys age in the future and shes gonna be two times johns age which john in the future hes gonna be j plus eight so these are the two equations that we have and we have two variables whenever you