Question 940009
Sarah's father is four times as old as mary. Five years ago he was seven times as old. How old is Mary and her father?
-----------------
Equations:
f = 4m
f-5 = 7(m-5)
-------
Substitute and solve for "m"::
4m-5 = 7m-35
3m = 30
m = 10 yrs (Mary's age now)
-----
f = 4m = 40 yrs (Father's age now)
===========
Cheers,
Stan H.
------------