You sold 4/5 of the nature photographs at the silent auction. what portion. of the photographs were unsold?

First, we'll want to know what the total amount of pictures is.

The fraction '4/5' implies that the whole fraction would be '5/5'.

Using that, we get 5/5 - 4/5

5/5 - 4/5 = 1/5

Therefore, 1/5 of the photographs were not sold.

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