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Biff is 25 years older than Hannah today. Four years from now, Biff will be 6 times as old as Hannah will be. How old is Hannah today? Use algebra to solve.

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today:
Hannah ---- x
Biff -------- x + 25

4 years from now:
Hannah = x+4
Biff = x + 25 + 4 = x + 29

x + 29 = 6(x+4)

solve for x

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