has several tables, and B has several chairs. If B uses all the chairs to exchange for the same number of tables, then B needs to pay A 320 yuan. It is known that the price of 3 tables is 48 yuan less than that of 5 chairs, so how many chairs does Yi have?
甲有桌子若干张，乙有椅子若干把，如果乙用全部椅子换回数量同样多的桌子，则乙需补给甲320元，如乙不补钱，就要少换回5张桌子．已知3张桌子比5把椅子的价钱少48元，那么乙原有椅子多少把？
<gadget id="calculator">320 / 5</gadget>
<output>64</output>

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