SOLUTION: Mrs Roberts is 3 times as old as her son. The sum of their ages is 48 years. How old was Mrs. Roberts when her son was born. Need an algebraic equation or inequality to solve.

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Question 971569: Mrs Roberts is 3 times as old as her son. The sum of their ages is 48 years. How old was Mrs. Roberts when her son was born. Need an algebraic equation or inequality to solve.
Answer by lwsshak3(11628) About Me  (Show Source):
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Mrs Roberts is 3 times as old as her son. The sum of their ages is 48 years. How old was Mrs. Roberts when her son was born. Need an algebraic equation or inequality to solve.
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let x=son's age
3x=Mrs Robert's age
x+3x=48
4x=48
x=12
3x=36
36-12=24
How old was Mrs. Roberts when her son was born? 24