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Can They Be Equal?

Age 11 to 14
Challenge Level

Can They be Equal? printable sheet

Charlie has been drawing rectangles:


The first rectangle has a perimeter of 30 units and an area of 50 square units.
The second rectangle has a perimeter of 24 units and an area of 20 square units.
Charlie wondered if he could find a rectangle, with a side of length 10 units, whose perimeter and area have the same numerical value. 
Can you find a rectangle that satisfies this condition?

Alison says "There must be lots of rectangles whose perimeter and area have the same numerical value."
Charlie is not so sure.

Can you find more examples of such rectangles?
Can you come up with a convincing argument to help Charlie and Alison decide if Alison is right?

Click here for a poster of this problem.