Question 1167870
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Sue is now three times as old as Joelle. Four years ago, Sue was 4 times as old as Joelle was then. Using x for Joelle, how old is Joelle now?
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z for Sue
x for Joelle


{{{system(z=3x,z-4=4(x-4))}}}


{{{3x-4=4(x-4)}}}

{{{3x-4=4x-4*4}}}

{{{highlight(4*4-4=x)}}}




12