Question 996286
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Jennifer is 9 years older than Kristina. Five years ago, Jennifer was twice as old as Kristina. How old are they now?
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Let J = Jennifer's current age;
    K = Kristina's current age.


Then 


J = K + 9,

J - 5 = 2*(K-5).   &nbsp;&nbsp;&nbsp;&nbsp;<<<--- 5 years ago.


As you said, &nbsp;this is all you want.


Good luck!