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Two identical rectangular cards are glued together as shown, to form an 'L' shape.

The perimeter of this 'L' shape is 40 cm.

What can you say about the length and width of the original rectangles?

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

*This problem is taken from the UKMT Mathematical Challenges.**View the archive of all weekly problems grouped by curriculum topic*

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