SOLUTION: In 9 years, Kathy will be 3 times as old as she was 7 years ago. What is Kathy's present age?

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: In 9 years, Kathy will be 3 times as old as she was 7 years ago. What is Kathy's present age?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 864388: In 9 years, Kathy will be 3 times as old as she was 7 years ago. What is Kathy's present age?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +k+ = her age now
+k+%2B+9+ = her age in 9 years
+k+-+7+ = her age 7 years ago
-------------------------------------
+k+%2B+9+=+3%2A%28+k+-+7+%29+
+k+%2B+9+=+3k+-+21+
+2k+=+30+
+k+=+15+
Her present age is 15
----------------------
check:
+k+%2B+9+=+3%2A%28+k+-+7+%29+
+15+%2B+9+=+3%2A%28+15+-+7+%29+
+24+=+3%2A8+
+24+=+24+
OK