There are 50 students in a class, 70% of the class can swim, and 3/5 of the 25 girls can swim. So, what percentage of boys can swim?
某班有学生50人，会游泳的占全班人数的70%，女生25人中有(3/5)会游泳．那么，男生中有几分之几会游泳？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">50 * (7/10)</gadget>
<output>35</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">25 * (3/5)</gadget>
<output>15</output>

<gadget id="calculator">35 - 15</gadget>
<output>20</output>

<gadget id="calculator">50 - 25</gadget>
<output>25</output>

<gadget id="calculator">20 / 25</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>