There are 210 students in the sixth grade of Hope Primary School, among which the number of boys accounts for (3/5) of the number of students in the sixth grade, and (1/6) of the boys are short-sighted. How many myopic boys are there in the sixth grade?
希望小学六年级有学生210人，其中男生人数占六年级人数的(3/5)，男生中有(1/6)的同学是近视的．六年级近视的男生有多少人？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">210 * (3/5) * (1/6)</gadget>
<output>21</output>

<result>21</result>