There are 100 students from Dongfeng Elementary School participating in the mathematics competition, and the average score is 75 points. Among them, the average score of the participating male students is 68 points, and the average score of the female students is 78 points. So how many female students are there in the school?
东风小学有100名学生参加数学竞赛，平均分是75分，其中参赛的男同学的平均分为68分，女同学的平均分为78分．那么该校有多少名女同学参赛？
<gadget id="calculator">75 * 100</gadget>
<output>7_500</output>

<gadget id="calculator">68 * 100</gadget>
<output>6_800</output>

<gadget id="calculator">7_500 - 6_800</gadget>
<output>700</output>

<gadget id="calculator">78 - 68</gadget>
<output>10</output>

<gadget id="calculator">700 / 10</gadget>
<output>70</output>

<result>70</result>