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Find number abc

If 73ca5 + ac317 = 1b3b6b find number abc. Multiple solutions may exist.

Correct answers: 5

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My friend asked me...

My friend asked me, "Why are you getting a divorce?"
I responded, "My wife wasn't home the entire night and in the morning she said she spent the night at her sister's house."
He said, "So?"
And I responded, "She's lying. I spent the night at her sister's house!"

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Millenium Bridge

In 2000, the Millenium Bridge - a footbridge across the River Thames - was opened by Queen Elizabeth. The radical new design was the work of architect Sir Norman Foster with sculptor Sir Anthony Caro and engineering support from Arup. It was the first new crossing of the River Thames in over 100. As the first few thousand people crossed the bridge, it developed an unexpected and potentially dangerous lateral "wobble". This caused people to unwittingly walk "in step", which increased the oscillation. The design had been adapted from a computer model typical for a car bridge, but which did not take into account the lateral forces associated with human walking. After structural damping was added to stop the oscillation, the bridge re-opened in 2002.«

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