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# Did You Find Out? Get the Answer to the Riddle of E-News Issue No. 3, June 2018

2018-07-17

## The broken window glass incident

Who has shot the ball?

In a courtyard, four teenagers are playing soccer until one of them breaks a window. The homeowner takes the four teenagers to task, but only (exactly) one person tells the truth:

Nicolas: Elena has kicked the ball.
Marc: It was not me!
Elena: Bastian did it.
Bastian: Elena is lying!

Can you figure out who has kicked the ball that broke the window?

## Solution

Assuming that only one of the statements is true, the following applies:

• If it was Nicolas, then Marc and Bastian are telling the truth.
• If it was Elena, then Nicolas, Marc, and Bastian are telling the truth.
• If it was Bastian, then Marc and Elena are telling the truth.
• If it was Marc, then only Bastian is telling the truth.

According to this reasoning, Marc kicked the ball that broke the window.

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