40% of the trees in a wood are disease . 75% of the trees in the world are elm . What is the least possible percentage of trees in the wood that are diseased elm ?
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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