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F=3S (a father is 3 times as old as his son)

F+15=2(S+15) (after 15 years the father will be twice as old as his sons age at that time)

F/3=S

F+15=2(F/3+15)

F+15=2(F/3)+2(15)

F+15=(2F)/3+30

F+15(-15)=(2F)/3+30(-15)

F=(2F)/3+15

F(3)=(2F)/3+15)(3)

3F=2F+45

3F(-2F)=2F+45(-2F)

F=45

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Q: A father is three times as old as his son After 15 years the father will be twice as old as his sons age at that time Therefore the fathers current age is?
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