The industrial and commercial department randomly checked some children's foods, 27 of which were qualified and 3 were unqualified. What is the passing rate of these children's foods?
工商部门抽查了部分儿童食品，其中有27种合格，3种不合格．这些儿童食品的合格率是多少？
<gadget id="calculator">27 + 3</gadget>
<output>30</output>

<gadget id="calculator">27 / 30</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>