Three classes in grade six donate for disaster relief. Class A’s donation is 2/3 of the other two classes’ donations. Class B’s donation is 3/5 of the other two classes’ donations. Class C’s donation is more than B The class donated less than 72 yuan, how much did the three classes donate in total?
六年级三个班救灾捐款，甲班捐款数是另外两个班捐款数的(2/3)，乙班捐款数是另外两个班捐款数的(3/5)，丙班捐款数比乙班捐款数少72元，三个班共捐款多少元？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

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

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</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>