There are 20 red flowers, which are less than yellow flowers (1/5). How many yellow flowers are there?
有红花20朵，比黄花少(1/5)，黄花有多少朵？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>