The students are going to plant 180 trees, and now (2/3) have been planted, of which (2/5) are planted in the sixth grade. How many trees have been planted in the sixth grade?
同学们要种180棵树，现在已经种了(2/3)，其中(2/5)是六年级种的，六年级种了多少棵？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">180 * (2/3) * (2/5)</gadget>
<output>48</output>

<result>48</result>