chair is 45 yuan, and the price of a table is 18 yuan less than three times that of a chair. How much is a table?
一把椅子45元，一张桌子的价钱比椅子的3倍少18元，一张桌子多少元？
<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">135 - 18</gadget>
<output>117</output>

<result>117</result>