The students wanted to plant 100 trees, and (3/5) were planted in the morning, among which (1/4) were planted by Class 1, Grade 6. How many trees are planted in a class of sixth grade?
同学们要植100棵树，上午植了(3/5)，其中的(1/4)是六年级一班植的．六年级一班植树多少棵？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 * (3/5) * (1/4)</gadget>
<output>15</output>

<result>15</result>