Agang Center Wanxiao donated money to Ya'an disaster area. The fifth grade donated twice as much as the fourth grade, the sixth grade donated 120 yuan more than the fifth grade, and the fourth grade donated 240 yuan. How much does the sixth grade donate?
阿岗中心完小为雅安灾区捐款，五年级捐的是四年级的2倍，六年级比五年级多捐120元，四年级捐款240元．六年级捐多少元？
<gadget id="calculator">240 * 2</gadget>
<output>480</output>

<gadget id="calculator">480 + 120</gadget>
<output>600</output>

<result>600</result>