The school organized the "Red Cross" donation activity, and the sixth grade students donated a total of 650 yuan, which was 150 yuan less than twice the amount donated by the fifth grade students. How much does the fifth grade student donate?
学校组织"红十字会"捐款活动，六年级学生共捐款650元，比五年级学生捐款数的2倍少150元．五年级学生捐款多少元．
<gadget id="calculator">650 + 150</gadget>
<output>800</output>

<gadget id="calculator">800 / 2</gadget>
<output>400</output>

<result>400</result>