The school pays 215.4 yuan for 6 tables and 4 chairs, 7.5 yuan for each chair, how much is each table?
学校买6张桌子和4把椅子共付215.4元，每把椅子7.5元，每张桌子多少钱？
<gadget id="calculator">4 * 7.5</gadget>
<output>30</output>

<gadget id="calculator">215.4 - 30</gadget>
<output>185.4</output>

<gadget id="calculator">185.4 / 6</gadget>
<output>30.9</output>

<result>30.9</result>