In the donation activity for the disaster area, the fifth grade donated 580 yuan, 20 yuan more than half of the sixth grade. How much did the sixth grade donate?
在为灾区捐款活动中，五年级捐了580元，比六年级捐的一半多20元．六年级捐了多少元？
<gadget id="calculator">580 - 20</gadget>
<output>560</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">560 / (1/2)</gadget>
<output>1_120</output>

<result>1_120</result>