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4. La mayoría de los metales preciosos se destina a joyas

Study this gallery of faces. Then try to recognise all the faces that are repeated in the second gallery (and identify the ones that are not).

AÑO

A problematic clock model

It’s problematic because the clock in question is not numbered, so we don’t know which of the time marks corresponds to 12, and the three hands are of identical lengths.

However, this does not prevent us from using logic to figure out what time it is.

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Fuente: Tulane University news.tulane.edu

4. La mayoría de los metales preciosos se destina a joyas

Study this gallery of faces. Then try to recognise all the faces that are repeated in the second gallery (and identify the ones that are not).

AÑO

A problematic clock model

Solution

Let A, B, C be the clock hands.

If we assume that B is the minute hand, then the clock would read 4:50 and the hour hand would be about to reach 5 o'clock. So we know that the time is 4:50. But we don’t know whether it’s morning or afternoon.

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Fuente: Tulane University news.tulane.edu