There are 150 students in the sixth grade of Yuying Primary School. Now select male students (1/4) and 10 female students to participate in tree planting, and the remaining number of male and female students is exactly equal. How many girls are there in the sixth grade of Yuying Primary School?
育英小学六年级共有学生150人．现在选出男同学的(1/4)和10个女同学参加植树，剩下的男女同学人数正好相等．育英小学六年级有多少个女生？
<gadget id="calculator">150 - 10</gadget>
<output>140</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">140 / (7/4)</gadget>
<output>80</output>

<gadget id="calculator">150 - 80</gadget>
<output>70</output>

<result>70</result>