During the winter vacation, the third-grade students made 45 lanterns, and the fourth-grade students made 18 fewer lanterns than the third-grade students. How many lanterns did the fourth-grade students make?
寒假里三年级同学制作灯笼45个，四年级同学制作灯笼的个数比三年级的2倍少18个，四年级同学制作灯笼多少个．
<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">90 - 18</gadget>
<output>72</output>

<result>72</result>