Now to buy a batch of tables and chairs with the same quantity, the table costs 320 yuan more than the chairs. If the extra 320 yuan is used to buy 5 tables, the cost of 3 tables is less than that of 5 chairs 48 yuan, so how many chairs did you buy this time?
现在购置一批数量相同的桌子和椅子，桌子比购椅子多用了320元，如果这些多用的320元钱用来买桌子可以买5张，而3张桌子的钱比5把椅子的钱还少48元，那么这次一共购置了多少把椅子？
<gadget id="calculator">320 / 5</gadget>
<output>64</output>

<gadget id="calculator">3 * 64</gadget>
<output>192</output>

<gadget id="calculator">192 + 48</gadget>
<output>240</output>

<gadget id="calculator">240 / 5</gadget>
<output>48</output>

<gadget id="calculator">64 - 48</gadget>
<output>16</output>

<gadget id="calculator">320 / 16</gadget>
<output>20</output>

<result>20</result>