The students made 80 paper flowers, including 60 red flowers, and the rest are yellow flowers. How many more red flowers are there than yellow flowers?
同学们做了80朵纸花，其中红花有60朵，其余的都是黄花，红花比黄花多多少朵．
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">60 - 20</gadget>
<output>40</output>

<result>40</result>