There are 32 yellow flowers, and 10 yellow flowers are twice as many as red flowers. How many red flowers are there?
黄花有32朵，黄花比红花的2倍少10朵，红花有多少朵．
<gadget id="calculator">32 + 10</gadget>
<output>42</output>

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

<result>21</result>