It takes (1/4) sheet of paper to cut a flower, Lele cuts 9 flowers, and Naughty cuts 11 flowers. How many sheets of paper did they use in total?
剪一朵花要用(1/4)张纸，乐乐剪了9朵，淘气剪了11朵．他们一共用了多少张纸？
<gadget id="calculator">9 + 11</gadget>
<output>20</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 * (1/4)</gadget>
<output>5</output>

<result>5</result>