The fourth and fifth grade students of a certain elementary school donated a total of 900 yuan to the earthquake-stricken area. Among them, the amount donated by the fifth grade students was 1.5 times that of the fourth grade students. How much did the fifth grade students donate?
某小学四、五年级学生共为地震灾区捐款900元，其中五年级学生捐款数是四年级的1.5倍，五年级学生捐款多少？
<gadget id="calculator">1.5 + 1</gadget>
<output>2.5</output>

<gadget id="calculator">900 / 2.5</gadget>
<output>360</output>

<gadget id="calculator">900 - 360</gadget>
<output>540</output>

<result>540</result>