Jack is three years older than Jill. Three years ago, Jill's age was fourfifths of Jack's age. How old is each now?
x = Jill’s age now
x + 3 = Jack’s age now {Jack is three years older than Jill} x  3 = Jill’s age three years ago x = Jack’s age three years ago {subtracted three from current ages} x  3 = (4/5)x {three years ago, Jill's age was fourfifths of Jack's age} 5x  15 = 4x {multiplied entire equation by 5 to eliminate fraction} x = 15 {subtracted 4x and added 15 to each side} x + 3 = 18 {substituted 15, in for x, into x + 3} Jill is 15 Jack is 18 Ask the House
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