There are 15 apple trees in the orchard, the number of peach trees is 2/3 of apple trees, and 2/7 of apricot trees, how many apricot trees are there?
果园里有苹果树15棵，桃树的棵数是苹果树的(2/3)，又是杏树的(2/7)，杏树有多少棵？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/3) / (2/7)</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">15 * (7/3)</gadget>
<output>35</output>

<result>35</result>