The fifth and sixth grade students of Donghua Primary School donated 900 yuan to Sichuan disaster relief. It is known that the ratio of the fifth grade donation to the sixth grade donation is 7:8, how much is the sixth grade donation?
东华小学五、六年级同学向四川赈灾捐款900元．已知五年级的捐款与六年级捐款的比是7：8，六年级捐款多少元？
<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">900 * (8/15)</gadget>
<output>480</output>

<result>480</result>