The students will plant 60 trees. On the first day I planted (1/3), of which (3/5) was planted in the sixth grade. How many trees did 6th grade plant on the first day?
同学们要植60棵树．第一天植了(1/3)，其中(3/5)是六年级植的．第一天六年级植了多少棵树？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">60 * (1/3) * (3/5)</gadget>
<output>12</output>

<result>12</result>