Xiaohua has 10 red balloons, and Xiaohua has 8 yellow balloons. Xiaohua trades 4 red balloons for Xiaohua's 3 yellow balloons. Now how many balls does Xiaohua and Xiaohua have?
小华有10个红气球，小花有8个黄气球．小华用4个红气球换小花3个黄气球，现在小华、小花各有几个球？
<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<result>9</result>