Liangliang needs to climb 18 steps from the second floor to the fourth floor, so how many steps does he need to climb from the first floor to the sixth floor?
亮亮从二楼到四楼需要爬18级台阶，那么他从一楼到六楼需要爬多少级台阶？
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<result>45</result>