There are 28 girls and 30 boys in the third class of the sixth year. How many boys account for the whole class?
六年三班有女生28人，男生30人，男生人数占全班人数的多少
<gadget id="calculator">28 + 30</gadget>
<output>58</output>

<gadget id="calculator">30 / 58</gadget>
<output>15/29 = around 0.517241</output>

<result>15/29 = around 0.517241</result>