There are 150 students in the first and second grades of a certain elementary school, exactly (1/6) of the whole school. Girls account for 40% of the total number of students in the school. How many boys are there in the school?
某小学一、二年级共有学生150人，正好是全校人数的(1/6)．全校女生占总人数的40%，全校男生有多少人？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">150 / (1/6)</gadget>
<output>900</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">900 * (3/5)</gadget>
<output>540</output>

<result>540</result>