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

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) (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
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Equations:
a = s + 7
a + s = 21
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Substitute for "a" and solve for "s":
s+7 + s = 21
2s = 14
s = 7 (sister's age now)
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Solve for "a"
a = s + 7
a = 7+7
a = 14 yrs (ahmed's) age now
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cheers,
Stan H.
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