There are 160 students in the third grade, 20 more boys than girls, how many girls are there?
三年级学生共有160人，男生比女生多20人，女生有多少人．
<gadget id="calculator">160 - 20</gadget>
<output>140</output>

<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<result>70</result>