There are 20 students lined up in a row, and it is required to place 4 pots of flowers between every 2 students. How many pots of flowers do you want in total?
有20名学生排成一排，要求在每2名学生中间放4盆花，共要几盆花？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">4 * 19</gadget>
<output>76</output>

<result>76</result>