Eleven plus two equals Nine

If eleven plus two equals one, what does nine plus five equal?




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what does the below rebus mean?

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6 25 64 ? 32 1

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Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

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Rubik’s Cube

The inventor of the Rubik’s Cube didn’t realize he’d built a puzzle until he scrambled it the first time and tried to restore it.