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A father is four times as old as his daughter. In 7 yrs, he will be three times as old as she is. How old is the daughter now?
let's make the daughter's age X so the father's age is 4X in seven years both of their ages are now seven years more so Father = 4X + 7 Daughter = X + 7 And the father is now three times older than his daughter so 4X + 7 = 3 (X + 7) then 4X + 7 = 3X + 21 subtract 7 and 3 x from both sides and you get 4X - 3X = 21 - 7 so X equals 14 the daughter is 14
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