Question 1043348
 Sarah is twice as old as Andy.
Mel is nine years older than Sarah.
The total of their ages is 94. How old is Mel? 
------
s = 2a
m = s + 9
s + a + m = 94
---------
a = (1/2)s
-------
Substitute for "a" and for "m" and solve for "s"::
s + (1/2)s + s + 9 = 94
2.5s = 85
s = 34 yrs
Ans: Mel = s+9 = 43 yrs
------------------
Cheers,
Stan H.
---------------