The construction site plans to bring in a batch of cement, 25% of the total amount will be shipped in the first time, and 180 tons will be shipped in the second time. At this time, the ratio of the tons that are shipped to the tons that are not shipped is 4:3. How many tons is a batch of cement?
建筑工地计划运进一批水泥，第一次运来总数的25%，第二次运来180吨，这时运来的与没运来的吨数比是4：3，工地计划运进的这批水泥是多少吨？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(4/7) - (1/4)</gadget>
<output>9/28 = around 0.321429</output>

<gadget id="calculator">180 / (9/28)</gadget>
<output>560</output>

<result>560</result>