There are 15 red flowers in the flower bed, and 3 yellow flowers are twice as many as the red flowers, how many yellow flowers are there in the flower bed?
花坛里有红花15朵，黄花比红花的2倍少3朵，花坛里有黄花多少朵？
<gadget id="calculator">30 - 2</gadget>
<output>28</output>

<result>28</result>