Xiao Ming and Xiao Hua compete to climb the stairs, Xiao Ming's speed is twice as fast as Xiao Hua's, when Xiao Ming climbs to the 7th floor, how many floors does Xiao Hua climb to?
小明和小华比赛爬楼梯，小明的速度是小华的两倍，当小明爬到第7楼时，小华爬到了多少楼．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<result>4</result>