The amount of trees in the world that aren’t elm are 25%, (100 - 75 = 25).

For the smallest possible amount of elm trees to be diseased, we must assume all of the non-elm trees are diseased.

40% (total diseased trees) - 25% (non-elm trees) = 15%

This is the smallest possible amount of elm trees that are diseased!

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Conor O’Halloran
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6 months ago


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