A certain primary school needs to use 110 tons of coal. First, it is transported 20 times by large truck, 1.5 tons each time, and the rest is transported by car, 4 tons each time. How many times will it take to transport the remaining coal?
某小学需用煤110吨，先用大车运20次，每次运1.5吨，剩下的改用汽车运，每次运4吨，剩下的要几次才能运完？
<gadget id="calculator">20 * 1.5</gadget>
<output>30</output>

<gadget id="calculator">110 - 30</gadget>
<output>80</output>

<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<result>20</result>