The escalator travels from bottom to top at a uniform speed. Two children feel that the elevator is too slow, so they rush up the escalator. Child A walks 26 steps per minute, and child B walks 14 steps per minute. As a result, child A takes 4 minutes to arrive. Upstairs, child B takes 6 minutes to reach the upstairs, how many steps does the escalator have?
自动扶梯以均匀的速度由下往上行驶，两个小孩嫌电梯太慢，急着从扶梯上楼，甲小孩每分钟走26级，乙小孩每分钟走14级，结果甲小孩用4分钟到达楼上，乙小孩用6分钟到达楼上，该扶梯共有多少级．
<gadget id="calculator">104 - 84</gadget>
<output>20</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 26</gadget>
<output>36</output>

<gadget id="calculator">36 * 4</gadget>
<output>144</output>

<result>144</result>