Xiao Ming lives on the 6th floor, and he walked a total of 60 steps from the 1st floor to the 5th floor. How many steps does he have to climb each time he goes up and down the stairs?
小明家住6楼，他从1楼上到5楼一共走了60级台阶，他上下一次楼，要爬多少级台阶．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

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

<gadget id="calculator">15 * 5 * 2</gadget>
<output>150</output>

<result>150</result>