Yucai Primary School has 900 students, among whom (1/5) are in the sixth grade, and (5/9) of them are boys. How many sixth grade boys are there?
育才小学有学生900人，六年级学生占(1/5)，其中的(5/9)是男生．六年级男生有多少人？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">900 * (1/5) * (5/9)</gadget>
<output>100</output>

<result>100</result>