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To clarify, the SON is 10 today, so the father is 40.
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The father is 40, and the son 10. 4 x 10 = 40In 20 years time the father will be 60 and the son 30. 2 x 30 = 60.So, what do I get?
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f = father's ages = son's age1. From "A father is four times as old as his son":f=4s2. From "Twenty years from now the father will be twice as old as the son":f + 20 = 2(s + 20)f + 20 = 2s + 40Substituting for f from 1.4s + 20 = 2s + 404s - 2s = 40 - 202s = 20s = 10Substituting for s in 1.f = 4 x 10f = 40The bloke is 40 and his son is 10In 20 years time, the father will be 60 and his son will be 30
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Tricky wroteTo clarify, the SON is 10 today, so the father is 40. so how old was dad when son was born
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"A father is four times as old as his son, Twenty years from now the father will be twice as old as the son. How old are the father and the son today?"My boss just set this question, if I answer it correctly I get to keep my job!!! WHats the answer?? ANd how do you work it out?
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haydn wrotef = father's ages = son's age1. From "A father is four times as old as his son":f=4s2. From "Twenty years from now the father will be twice as old as the son":f + 20 = 2(s + 20)f + 20 = 2s + 40Substituting for f from 1.4s + 20 = 2s + 404s - 2s = 40 - 202s = 20s = 10Substituting for s in 1.f = 4 x 10f = 40The bloke is 40 and his son is 10In 20 years time, the father will be 60 and his son will be 30 Ohmigod! There was a reason to listen and understand algebra at school, that is the first ever example I've seen of it being used since leaving school!!
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