Question 415873
Let the length of a rectangle is {{{x}}}, then the width is {{{x-5}}}.
The perimeter is {{{2*(a + b) = 2*(x + (x - 5)) = 30}}}.
Then:
{{{2*(x + x - 5) = 30}}}
{{{2*(2x - 5) = 30}}}
{{{4x - 10 = 30}}}
{{{4x = 40}}}
{{{x = 10}}}
{{{x - 5 = 5}}}

Answer: the length of a rectangle is 10 inches and the width is 5 inches.