Investigate the number of people who can swim and ride bicycles among the 63 students in Class 5. Among them, those who can swim account for the total number (7/9), and those who can ride a bicycle account for the total number (5/7). There are 6 students who can't do both. How many students are there in both?
在五年一班的63名同学中调查会游泳和会骑自行车的人数．其中会游泳的占总人数的(7/9)，会骑自行车的占总人数的(5/7)，有6位同学两样都不会．两样都会的同学有多少人？
<gadget id="calculator">37 / 63</gadget>
<output>37/63 = around 0.587302</output>

<gadget id="calculator">63 * (37/63)</gadget>
<output>37</output>

<result>37</result>