The school bought back 4 tables at 135 yuan each. He bought some chairs back, and it is known that the price of 6 chairs is exactly equal to the price of 4 tables. How much is each chair.
学校买回4张桌子，每张135元．又买回一些椅子，已知6把椅子的价钱正好等于4张桌子的价钱．每把椅子多少元．
<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">135 * (2/3)</gadget>
<output>90</output>

<result>90</result>