The fourth, fifth and sixth grades of Yongsheng Primary School donated a total of 2,040 yuan, and the ratio of donations among the three age groups was 15:16:20. How much is the donation for the sixth year?
永胜小学四、五、六年级共捐款2040元，三个年纪捐款的比是15：16：20．六年纪捐款多少元？
<gadget id="calculator">15 + 16 + 20</gadget>
<output>51</output>

<gadget id="calculator">20 / 51</gadget>
<output>20/51 = around 0.392157</output>

<gadget id="calculator">2_040 * (20/51)</gadget>
<output>800</output>

<result>800</result>