Question 223776
Find the dimensions of the rectangle meeting the specified conditions
the perimeter is 320 cm and the width is 20 cm less than the length


Step 1.  Let L be the length


Step 2.  Let L-20 be the width since it's 20 cm less than the length


Step 3.  Perimeter P means adding up all 4 sides of the rectangle.


Step 4.  Then, P=L+L+L-20+L-20=320 since perimeter is 320 cm.


*[invoke explain_simplification "L+L+L-20+L-20=320" ]


With {{{L=90}}} and L-20=70}}}.  Also {{{P=2(90+70)=320}}} which is a true statement.


Step 5.  The dimensions are that the length is 90 cm and the width is 70 cm.


I hope the above steps were helpful. 


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And good luck in your studies!


Respectfully,
Dr J


drjctu@gmail.com


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