The students go to the forest park by car. Each car can hold 45 people. The first three cars are all full, and the fourth car has 18 vacancies. How many students go to the forest park?
同学们乘车去森林公园，每辆车可乘坐45人，前3辆车全部坐满，第四辆车还有18个空位，共有多少位同学到森林公园去．
<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">45 - 18</gadget>
<output>27</output>

<gadget id="calculator">135 + 27</gadget>
<output>162</output>

<result>162</result>