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The diagram shows a cuboid in which the area of the shaded face is one quarter of the area of each of the two visible unshaded faces.
The total surface area of the cuboid is $72\text{cm}^2$. What is the area of one of the unshaded faces of the cuboid?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
Shaded End
Age 11 to 14
ShortChallenge Level 
The diagram shows a cuboid in which the area of the shaded face is one quarter of the area of each of the two visible unshaded faces.The total surface area of the cuboid is $72\text{cm}^2$. What is the area of one of the unshaded faces of the cuboid?
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.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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