SOLUTION: Sandy was 25 years old when her son was born. Her present age is 7 years less than three times her son's present age. How old is Sandy now?

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Question 1153474: Sandy was 25 years old when her son was born. Her present age is 7 years less than three times her son's present age. How old is Sandy now?

Answer by ikleyn(52900) About Me  (Show Source):
You can put this solution on YOUR website!
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Let x = Sandy's age (the unknown under the question).

Then her son's age is (x-25) years.


From the condition,


    x = 3*(x-25) - 7.


Hence,

    x = 3x - 75 - 7

    x = 3x - 82

    82 = 3x - x

    82 = 2x

     x = 82%2F2 = 41.


ANSWER.  Sandy is 41 years old.