The school bought several new sets of tables and chairs. A table costs 220 yuan. It is known that the ratio of the value of the table to the price of the chair is 11:7. How much is a chair?
学校新买了若干套桌椅，一张桌子220元，已知桌子的价值与椅子价钱的比是11：7，一把椅子多少元？
<gadget id="calculator">220 / 11</gadget>
<output>20</output>

<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<result>140</result>