For example: 18, what are the two nineties? 18× 2/9 = 4

Continuous application problem: There are 120 apple trees in the orchard, pear trees are three quarters of apple trees and peach trees are two thirds of pear trees. How many peach trees are there? 120× 3 4× 2 3

= 90× 2/3

=60 (tree)

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