The ratio of the original cement weight of the two construction teams of A and B is 1:3. After transporting 40 tons each, the weight ratio of cement between teams A and B is 3:4. It turns out how many tons of cement A has.
甲乙两个建筑队原有水泥重量的比是1：3．各运进40吨后，甲乙两队水泥重量的比是3：4．原来甲有水泥多少吨．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * 40</gadget>
<output>30</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<gadget id="calculator">(3/4) * 3</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">(9/4) - 1</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">10 / (5/4)</gadget>
<output>8</output>

<result>8</result>