There are 28 more girls than boys participating in the mathematics competition. All the boys are excellent, and girls (3/4) are excellent. A total of 42 male and female students are excellent. How many girls participated?
参加数学竞赛的女生比男生多28人，男生全部得优，女生(3/4)得优，男、女生共42人得优．女生参赛的有多少人？
<gadget id="calculator">28 + 42</gadget>
<output>70</output>

<gadget id="calculator">3 / 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">70 / (7/4)</gadget>
<output>40</output>

<result>40</result>