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$E$ is opposite $X$
When the shape is folded up, imagine $X$ is on top. This means $B$ is on the left hand face and $C$ is on the right hand face. This means $A$ is on the back face and $D$ is on the front face. This leaves $E$ on the bottom face, so opposite $X$.
Net Result
Age 11 to 14
ShortChallenge Level 
$E$ is opposite $X$
When the shape is folded up, imagine $X$ is on top. This means $B$ is on the left hand face and $C$ is on the right hand face. This means $A$ is on the back face and $D$ is on the front face. This leaves $E$ on the bottom face, so opposite $X$.
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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