The mass ratio of the original cement of the two construction teams of A and B is 4:3. Now, after Team A gives 55 tons of cement to Team B, the mass ratio of cement between Team A and Team B is 3:5. How many tons of cement does Team A have?
甲乙两个建筑队原有水泥的质量比是4：3．现在甲队给乙队55吨水泥后，甲乙两个队水泥质量比是3：5，原来甲队有水泥多少吨？
<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">3 + 5</gadget>
<output>8</output>

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

<gadget id="calculator">(4/7) - (3/8)</gadget>
<output>11/56 = around 0.196429</output>

<gadget id="calculator">55 / (11/56)</gadget>
<output>280</output>

<gadget id="calculator">280 * (4/7)</gadget>
<output>160</output>

<result>160</result>