Two trucks, A and B, jointly transport 100 tons of cement, each of which has been transported 4 times and just finished. Truck A transports 10 tons each time. How many tons does truck B transport each time? (column equation)
甲，乙两辆货车合运100吨水泥，各运4次正好运完，甲车每次运10吨，乙车每次运多少吨？(列方程)
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">100 - 40</gadget>
<output>60</output>

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

<result>15</result>