Question 884488
Write out the words into mathematics first.
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"length of a rectangle is twice that of its width"
{{{L=2W}}}
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"area of the rectangle is 72 inches"
The area of a rectangle is {{{A[r]=L*W}}}
{{{L*W=72}}}
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Substitute from above,
{{{2W*W=72}}}
{{{W^2=36}}}
{{{W=6}}}
Then going back,
{{{L=2W}}}
{{{L=2(6)}}}
{{{L=12}}}