There are 60 students in Class 2, Grade 6, of which 70% are boys, so how many girls are there?
六年级2班有学生60人，其中男生占七成，那么女生有多少人．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">60 * (3/10)</gadget>
<output>18</output>

<result>18</result>