On the day of the Dragon Boat Festival, Aunt Zhang made a total of 75 rice dumplings, of which egg yolk rice dumplings accounted for 20% of the total, and the ratio of egg yolk rice dumplings to meat rice dumplings was 3:7. How many meat dumplings did Aunt Zhang pack?
端午节那天，张阿姨一共包了75只粽子，其中蛋黄粽占总数的20%，蛋黄粽与肉粽的比是3：7．张阿姨包了多少只肉粽？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">75 * (1/5)</gadget>
<output>15</output>

<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">15 * (7/3)</gadget>
<output>35</output>

<result>35</result>