The sixth grade students held a charity sale for the Ya'an earthquake-stricken area. Girls donated 1,800 yuan, and boys donated 1.5 times that of girls. How much did the sixth grade students donate in total?
六年级同学为雅安地震灾区举行义卖活动，女生捐了1800元，男生捐的是女生的1.5倍，六年级同学一共捐了多少钱？
<gadget id="calculator">1_800 * 1.5</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 + 1_800</gadget>
<output>4_500</output>

<result>4_500</result>