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.
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