A tall building has the same number of steps on each floor, and adults go up the stairs twice as fast as children. One day, because the elevator was being repaired, they walked up from the first floor at the same time. When the child reached the sixth floor, how many floors did the adult go to?
一幢高楼，每层台阶数一样多，大人上楼比小孩速度快一倍．一天，由于电梯正在修理，他们同时从一楼往上走，小孩到达6楼时，大人走到多少楼．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>11</result>