SOLUTION: ahmed is 7 years older than his sister if the sun of their ages is 21 years find their ages

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: ahmed is 7 years older than his sister if the sun of their ages is 21 years find their ages      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 691839: ahmed is 7 years older than his sister if the sun of their ages is 21 years find their ages
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
ahmed is 7 years older than his sister if the sun of their ages is 21 years find their ages
------
Equations:
a = s + 7
a + s = 21
----
Substitute for "a" and solve for "s":
s+7 + s = 21
2s = 14
s = 7 (sister's age now)
----------------------
Solve for "a"
a = s + 7
a = 7+7
a = 14 yrs (ahmed's) age now
================================
cheers,
Stan H.
================