Students in high, middle and low grades of a certain elementary school donated money to the "Hope Project". The contribution of the senior grade is (2/3) of the total contribution of the other two grades. The contribution of the middle grade is (3/5) of the total contribution of the other two grades. It is known that the lower grades donated 144 yuan less than the middle grades, how much is the total donation of the whole school?
某小学高、中、低三个年级的学生给"希望工程"捐款．高年级的捐款数是另外两个年级的捐款总数的(2/3)．中年级的捐款数是另外两个年级捐款总数的(3/5)．已知低年级比中年级少捐款144元，全校共捐款多少元？
<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">3 + 2</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">144 / (3/20)</gadget>
<output>960</output>

<result>960</result>