Question 1017205
Andrew is 87 years younger than Katie. 9 years ago, Katie's age was 4 times Andrew's age. How old is Andrew now?
----------
a = k-87
k-9 = 4(a-9)
-----
Substitute for "k" and solve for "a"::
(a+87-9) = 4a-36
-------
78 = 3a - 36
------
3a = 114
a = 38 (Andrew's age now)
---------------
Cheers,
Stan H.
------------