Use a car and a tricycle to transport a batch of goods. The car transported this batch of goods (3/7), and the tricycle transported the rest (1/4). It is known that the car transported 300 kg more than the tricycle. Find this batch How many kilograms are there in total?
用汽车，三轮车各一辆运一批货物，汽车运了这批货物的(3/7)，三轮车运了余下的(1/4)，已知汽车比三轮车多运了300千克，求这批货物共有多少千克？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

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

<gadget id="calculator">(4/7) * (1/4)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(3/7) - (1/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">300 / (2/7)</gadget>
<output>1_050</output>

<result>1_050</result>