Question 1006915
{{{1/x}}} Shawna's rate.  Numerator of 1 is for ONE day's work.  x is how much time.


Erica's rate is {{{1/(x+6)}}}.



First part of description means  {{{1/x+1/(x+6)=1/4}}}.
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Fraction Skills!  Multiply left side and right side by  {{{4*x*(x+6)}}}.