There are 45 large trucks parked in the parking lot, the number of passenger cars is twice that of trucks, and there are 20 more small cars than the sum of large trucks and passenger cars. How many small cars are there in the parking lot?
停车场停有大货车45辆，客车的数量是货车的2倍，小汽车比大货车和客车的总和还多20辆，停车场有小汽车多少辆？
<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">90 + 45 + 20</gadget>
<output>155</output>

<result>155</result>