Sandy's orchard has only apple trees and pear trees and she is wanting to add some avocado trees. currently, there are 4 apple trees for every 3 pear trees. she is wanting to plant enough avocado trees so that she has 2 avocado trees for every 5 pear trees in the orchard. sandy is planting 18 avocado trees, making the ratio of avocado trees to apple trees be to .

For every 3 pears there are 4 apples; therefore 1 pear = 1.33 apple.And in every 5 pears, there are 2 avocados; therefore 1 avocado = 2.5 pears.Since there are 18 avocado trees, the number of pears would be 45 pear trees. And since there are 45 pear trees, there will be 59.85 apple trees, rounding it off to 60 apple trees. So the ratio of avocado trees to apple trees would be 18 to 60 or 18: 60.

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(I think this is the answer)