Three groups donate for disaster relief, one group's donation is (2/3) of the other two groups' donations, and the second group's donation is (3/5) of the other two groups' donations. The third group donated 72 yuan less than the second group. How much did the three groups donate in total?
三个小组救灾捐款，一组捐款数是另外两组捐款数的(2/3)，二组捐款数是另外两组捐款数的(3/5)．三小组比二小组少捐72元，三个小组共捐款多少元？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(3/5) / (8/5)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">(2/3) / (5/3)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (3/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(3/8) - (9/40)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">72 / (3/20)</gadget>
<output>480</output>

<result>480</result>