To process a batch of parts, A first processes (2/5) of this batch of parts, and then B processes the rest (4/9). It is known that the number of parts processed by B is 200 less than that of A, how many parts are there in total in this batch.
加工一批零件，甲先加工了这批零件的(2/5)，接着乙加工了余下的(4/9)．已知乙加工的个数比甲少200个，这批零件共有多少个．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(3/5) * (4/9)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(2/5) - (4/15)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">200 / (2/15)</gadget>
<output>1_500</output>

<result>1_500</result>