There are 600 pear and peach trees in the orchard, of which the number of peach trees is three times that of pear trees. How many pear trees are there?

Arithmetic method: 600 (3 + 1) = 150 (trees)
Equation method
Suppose there are x pear trees
x+3x=600
4x=600
x=600÷4
x=150
A: there are 150 pear trees

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