Xiaohua is practicing typing, and he has typed 63 in 7 minutes. At this speed, how many can he type in 9 minutes?
小华正在练习打字，7分钟打了63个，照这种的速度，他9分钟能打多少个？
<gadget id="calculator">63 / 7</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>