There are 18 red flowers, 2 more than 4 times the number of yellow flowers, how many yellow flowers?
红花18朵，比黄的4倍多2朵，黄花多少朵？
<gadget id="calculator">18 - 2</gadget>
<output>16</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>