A boss took 41 employees to drink. The restaurant owner said that every 20 bottles he drank would give him a free bottle. How many bottles of wine did the boss want to buy in total?
一个老板带着41名员工去喝酒，饭店老板说每喝20瓶送1瓶，问这个老板一共要买多少瓶酒？
<gadget id="calculator">41 + 1</gadget>
<output>42</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<gadget id="calculator">42 / 21</gadget>
<output>2</output>

<gadget id="calculator">42 - 2</gadget>
<output>40</output>

<result>40</result>