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“How many metric tons of steel were used to build this?”

The Elbphilharmonie in Hamburg:

Although it looks light and airy, it weighs a whopping two hundred thousand metric tons. Write to us if you think you can guess how many tons are made of steel.

One winner of an iPad mini 3 will be chosen at random from all the correct entries.

Prize drawing rules:

Entry deadline: 20 June 2017. The winner will be chosen at random from the correct entries. The entrant is not required to pay a fee or perform a service to participate. Employees of thyssenkrupp Steel Europe AG and their dependents are not eligible. The judges’ decision is final. Note: Your personal data will be used for the purposes of the competition only.

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