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calculate the LENGTH of the other side

I have two rectangles and one is taller than the other but they have same perimeter.
 
The other measures width  10 
                              length 25
No dimensions given for the second one and the question is
 *Calculate the length of the other side 

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Arthur D. | Effective Mathematics TutorEffective Mathematics Tutor
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there are infinitely many answers
you have a 10 by 25 which has a perimeter of 70
a taller one than this would be:
11 by 24, 12 by 23, 13 by 22, 14 by 21, 15 by 20, and so on (and don't forget the decimal and fractional answers)
if the 10 by 25 is the taller of the two the shorter would be:
9 by 26, 8 by 27, 7 by 28, 6 by 29, 5 by 30, and so on (and don't forget the decimal and fractional answers)