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John is half Fred’s age. Fred is ten years older than John. How old is Fred?
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Let j and f be John and Fred's ages, respectively.

j = 0.5f        (i)

j + 10 = f    (ii)

0.5f + 10 = f

10 = f - 0.5f = 0.5f

(10/0.5) = f = 20.

Therefore Fred is 20 years old.
by Diamond (40,182 points)

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