A, B, and C donate money to the disaster area. A’s donation is (1/3) of the other two’s total donations, and B’s donation is (3/5) of the other two’s total donations. The donation of C is known It is 240 yuan, how much is the total donation of the three people?
甲、乙、丙三人向灾区捐款，甲捐款数是另外两人捐款总数的(1/3)，乙的捐款数是另外两人捐款总数的(3/5)，已知丙的捐款数是240元，求三人一共捐款多少元？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<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">1 - (1/4) - (3/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">240 / (3/8)</gadget>
<output>640</output>

<result>640</result>